Thanks for your query.
I have read your query & I understand your concerns.
Following is my reply:
1) The spotting could be one of the signs of ovulation or if she had ovulated and conceived, it could be an implantation
bleeding due to implantation of embryo.
2) The ovulation could have been missed by ultrasound
by mistake. Hence I would suggest you go for other mode of ovulation testing like ovulation strips, serum LH levels along wih ultrasond to predict accurate ovulation
3) try changing the brand and batch of hCG
you have taken next time as some hCG inj are defective.
I hope I answered your query. I will be available for any followup queries you have.
IVF & Infertility