Yes, I am a male scientist that studies IVF. ((((posted by a scientist ghost)))
i hope it will help you all
But my statement still stands. Cramps are common side effects from progesterone, and cannot indicate pregnancy in IVF cycles. So absence of cramps does not indicate absence of pregnancy. Using cramps as an indicator can give wrong impressions in either direction.
Don't take my word for it. Here's the page on drugs.com that describes the side effects of Crinone, a common progesterone supplement FDA-approved for use in assisted reproduction:
http://www.drugs.com/mtm/crinone.html
"Other, less serious side effects are more likely to occur, such as:
* mild nausea, vomiting, bloating, stomach cramps..."
There's a long list.
At implantation embryos are smaller than salt grains. You cannot sense them. The tiny amount of hCG they make at that stage also cannot be sensed, unless you are having OHSS. Worsening OHSS is the only sign of pregnancy you can have on the 2WW.