I started my period on 22nd December and finished on 25th. My husband and I had unprotected sex for the first time on 27th December. On the 28th I started feeling really sick, a little light headed, I was peeing old pooping a lot more than normal and I was cramping down below. The cramping has eased off but I'm getting a niggle in what feels like my right ovary. Also my breasts have been aching/burning the past 2 days. I also feel quite weak today. I went to the doctor this morning, he did a pregnancy test but it came back negative (it would be negative as its too early to test) so he thinks I have stomach flu instead. Are these symptoms all in my head or could I actually be pregnant? Has anyone else had these symptoms after 1 week?