I'm 24 years old and have had regular periods since I was 13. I have not had sex but have done other things..Last month my period came on time but only lasted a day..then 2 weeks later it came full force.. now I'm a week late and freaking out. I took a pregnancy test and it came out negative but there are no signs what so ever of me getting it any more.. My boobs were sore and huge but now they're not.. I got little cramps here and there. Should I take another pregnancy test even though I'm not having sex? Can thinking about it cause your period to stop?