Thanks Deb, you've pretty much confirmed everything i was thinking. I am feeling confident that my cd21 tests will be pretty accurate as I got a positive opk on cd13, so would assume that I o'd on cd14 or thereabouts which means cd21 should be about spot on give or take a day.

I am also worried about the low levels of prog. making it impossible to maintain a pregnancy, assuming of course I am o'ing and that little egg is getting fertilised. I must say, considering I have fallen so easily in the past and my gyno expected no further problems, I have wondered if this is what might be happening.

I guess I am more terrified of assisted conception generally than of the actual drug itself. But I must say, the thought of twins at this stage is a little appealing! I am not naive when it comes to raising twins, I've seen it first hand and know how challenging it can be on a daily basis but at the same time if i never had to do this again I would be very relieved!! Three little babies in my arms would be more than I could hope for. It's such a hard journey for some of us, well worth it in the end of course, but still tough and I am struggling with it at the moment.

Thanks again for your reply, I will let you know how I go next week after speaking to my gyno

Hope you are feeling well and that little baby is getting nice and sticky in there!