I too was on ovidrel HCG shot mine was 250ug which is 6500 iu. It took 6 days to get out of my system. It depends on how many iu are used in your injection some people use 10'000 iu and it takes 10 or eleven days. For every thousand iu it takes one full day to get it out of your system. I used the dollar tree brand and tested evryday til it was gone. These test are cheap but they work great for this. hope this helps
It could possible be the ovidrel. I agree with rdh, you need to contact your Dr. for bloodwork. I wish you luck, and sure hope it's a true BFP!!!!
I am sorry I do not know the answer to this question. But I recommend you contact your doctor and let them know about your BFP and see what the say!!
Good luck and I hope it is the stickiest BFP ever!!