The main purpose of a trigger shot in IVF is to release mature eggs at the right time, increasing your chances of pregnancy.
Ovulation usually happens within 24–36 hours, and when timed correctly, pregnancy success rates can go up to 18%–30%.
If you’re wondering how it works, when pregnancy happens, and what to expect after the shot here’s a complete guide.
Ovulation time: 24–36 hours
Egg retrieval: within 36 hours
Pregnancy test: after 14 days
Success rate: 18%–30%
What is the Purpose of Trigger Shot in IVF?
The main purpose of a trigger shot in IVF is to help the ovaries release mature eggs at the right time. This injection contains the hormone hCG, which mimics the body’s natural LH surge and prepares the eggs for ovulation.
Doctors usually give the trigger shot 24–36 hours before egg retrieval or ovulation. Proper timing is important because it ensures the eggs are fully developed and ready for fertilization.
In simple terms, the trigger shot helps control when ovulation happens, increasing the chances of successful IUI or IVF treatment.
How Trigger Shot Increases Pregnancy Chances
A trigger shot improves pregnancy chances by ensuring that ovulation happens at the right time. In many cases, natural ovulation may be irregular or unpredictable.
With the help of a trigger shot:
Eggs mature properly before release
Ovulation timing becomes controlled
Fertilization is better planned
This controlled timing allows doctors to schedule egg retrieval or insemination more accurately, which directly improves the chances of pregnancy.
Success Rate of Trigger Shot in IVF
The success of a trigger shot depends mainly on timing and individual fertility factors.
Studies show that:
Pregnancy rate without trigger shot: around 5.8%
Pregnancy rate with trigger shot: around 18.2%
When combined with natural LH surge: up to 30.8%
These numbers clearly show that using a trigger shot at the right time can significantly increase the chances of pregnancy during fertility treatments.
When Do You Ovulate After Trigger Shot?
Ovulation typically occurs within 24 to 36 hours after the trigger shot.
This is why doctors carefully plan procedures like:
Egg retrieval in IVF
Intrauterine insemination (IUI)
The timing is critical because releasing the egg too early or too late can reduce the chances of fertilization.
How Many Days After Trigger Shot Pregnancy Occurs?
Pregnancy does not happen immediately after the trigger shot.
Here’s what usually happens:
Ovulation: within 24–36 hours
Fertilization: shortly after ovulation
Implantation: 6–10 days later
Doctors recommend taking a pregnancy test after 14 days. Testing earlier can give a false positive result because the trigger shot contains hCG, the same hormone detected in pregnancy tests.
What Happens After Trigger Shot? (Timeline)
Understanding the timeline can help reduce anxiety and set the right expectations.
Day 1 (Trigger Shot Given):
The hormone starts preparing the eggs for release.Day 2 (24–36 Hours):
Ovulation occurs, and eggs are released from the ovaries.Day 3–5:
Fertilization may happen if sperm meets the egg.Day 6–10:
The fertilized egg may implant into the uterus.Day 14:
You can take a pregnancy test for accurate results.Symptoms After Trigger Shot
After receiving the trigger shot, it’s normal to experience mild symptoms such as:
Pain or tenderness at the injection site
Bloating or abdominal discomfort
Mild cramping
In some cases, women may experience Ovarian Hyperstimulation Syndrome (OHSS), which can cause:
Swelling in the ovaries
Rapid weight gain
Shortness of breath
When Should You Consult a Fertility Expert?If you’re planning IVF or still unsure about your chances after a trigger shot in IVF, it’s important not to delay expert advice. Early consultation can make a significant difference in treatment success and overall outcomes.
If you relate to any concerns discussed above like timing of ovulation, pregnancy chances after trigger shot, or irregular cycles—it’s best to speak with a specialist at the right time.
Vardaan IVF Clinic in Amritsar offers advanced fertility care with a strong clinical track record, helping couples improve their chances of conception through personalized treatment plans.
24+ years of experience in fertility treatments
30,000+ successful IVF journeys
Up to 80% success rate across multiple cycles
Centres available in Jalandhar and Amritsar
If you’re considering treatment or want clarity on your fertility journey, consulting an experienced IVF specialist in Amritsar can help you take the right next step with confidence.
Frequently Asked Questions (FAQs)
1. How do you feel after a trigger shot for IVF?
Most women feel mild side effects like bloating, cramping, or injection site pain. These symptoms are usually temporary and manageable.
2. What happens if you miss your trigger shot?
Timing is very important. Missing or delaying the shot—even by a few hours—can affect ovulation and reduce the success of the cycle. Contact your doctor immediately if this happens.
3. How long after the trigger shot is insemination done?
IUI or egg retrieval is usually scheduled 24–36 hours after the trigger shot, as this is when ovulation occurs.
4. What is a trigger shot?
A trigger shot is an injection containing hCG hormone that helps mature and release eggs, making it a key step in IVF and IUI treatments.
5. What are the chances of getting pregnant with a trigger shot?
The chances can increase to 18.2% or even up to 30.8% when the trigger shot is timed correctly with ovulation.
