I have the exact same question! Had my IUI on 8/15 and booster on the 21st. I am so confused. IUI was on CD 9 and normally I start 2 weeks after.
Do you have symptoms that you think could be either PMS, PG or the HCG shot? It's driving me crazy!
I found out from the nurse at my doctor's office that it can delay af but it does not always delay it. I am bummed because I thought if af were late I would have my answer, but I guess I will just have to hang in there and wait until Sept. 19 to find out.
The only symptom I have is bloating and that started just hours after I got my trigger hcg shot so I know it is because of the shot.
I know this wait is going to drive me crazy too. Good luck. I hope you get your bfp!!!
. My symptoms were much worse after the booster than they have ever been with the trigger (cramps, sore breasts, backache)....Best of luck to you!