I have a very irregular period. Some months it's regular but for the most part it dies what ut wants. My boyfriend and I had sex about 3 weeks maybe 4 ago and I haven't had a period but my stomach has been hurting I've been dry heaving my mood swings are out rageous and I've been sleeping a ton. A couple days after when I assumed I was supposed to start I took a test and it was negative. I waited a week still negative I took two this week and still negative. I'm really really not trying to get pregnant in fact that's my bottom of my have time fors list. Should I trust the home tests?