I am normally very regular, having a period every 28 days and always lasting 5 days. I was supposed to start on 4/12 but started a week early on 4/5. It was much lighter than normal (but not just spotting) and only lasted 3 days. It stopped for 2 days but began again today 4/10. I have been nauseous after eating for about 2 weeks, no matter what I eat. I had unprotective sex a few times earlier this month. I took a home pregnancy test yesterday but it showed negative. I have one child but did not experience any bleeding or morning sickness with that pregnancy. Are these possible signs of pregnancy or is there something else that could be wrong?