I was supposed to get my period a couple days ago, and i still haven’t gotten it yet. My boyfriend and I have had sex, but only for 10 minutes and neither of us finished. I am worried that I might be pregnant because my cycle is pretty normal and I have never missed a period. I did read, however, that missing a period can result from stress (which I have been experiencing a lot of lately). Please let me know if you think it is normal for an 18 year old to miss her period and not be pregnant. Thanks!