I had my third round of a 5-day blast transfer 7 days ago and tested obsessively. I got a very faint line (make sure you wait the allotted time I had been throwing the tests away after if didn't show up right away), at 4.5 days. I didn't notice any symptoms the first 4 days except some pains that I would not describe as cramps on either side of my lower abd (where I would imagine the ovaries would be)---and I am a gestational carrier so I didn't have to harvest eggs. After the positive I noticed some dizziness with positional changes, and a very minor change in breast soreness.