What to Expect After the Injection?
After an hCG injection, the body may experience temporary hormonal changes that can cause mild symptoms, while the expected effects and timing depend on why the injection was prescribed.
Ovulation timing
For women receiving the hcg injection for fertility as a trigger shot, ovulation typically occurs 36 to 40 hours after the injection. This timing is why egg retrieval in IVF is scheduled precisely: the procedure is usually performed about 34 to 36 hours post-injection, just before natural ovulation would occur. If you are doing timed intercourse or intrauterine insemination (IUI), your doctor will advise the optimal window.
Physical sensations
After the injection, some women notice mild pelvic discomfort, bloating, or breast tenderness. These sensations usually reflect the hormonal activity in the follicles and are generally short-lived. At the injection site, mild redness or soreness for a day or two is normal.
Monitoring
Your doctor may schedule a follow-up ultrasound to confirm ovulation has occurred, or blood tests to check hormone levels. Do not skip these appointments; they help your care team track your response and catch any complications early.
Pregnancy tests
Because HCG is the hormone detected by home pregnancy tests, a test taken within 10 to 14 days of the injection may give a false positive. Wait for your doctor to confirm a result through a blood test at the right time.