OK, well, since it was only in her 32nd week that she finally got the date estimate, yes, it's certainly possible she could have gotten pregnant from sex around April 27 but it's also possible that the earlier sex produced the baby, especially given that she had the baby so much earlier than her estimated due date. (Unless the baby was noticeably premature.) She should get a DNA test done to be sure.
Hi, I suppose so. Can you give some dates or name the issue? Doctors will say it can be off by +/- 7 days at 12 weeks GA, and off by up to 3 weeks by 40 weeks GA.