I'm 20 years old, and my cycle has never really been regular. I've been under a great amount of stress as of late, and i have yet to receive my visit from "aunt flow". It's been about 17-19 days from when I should have started (as i've said my cycle has never been regular, it's somewhere between 35-45 days), and i'm beginning to get a bit worried. I have not had unprotected intercourse, nor have I had a condom break. I have been having cramps off and on for about a month (I normally start getting them as far as two weeks before my period), and I've been around friends and family while they were pregnant. But i have had morning sickness, I haven't gained or lost weight, i haven't seen any sort of physical change in my breasts, nor are they really sore. I have seen my OB/GYN a few months ago, so i'm fairly certain it isn't anything dangerous. I've decided to take a pregnancy test, just to be sure, but I would like to know if anyone else thinks there is really any cause for alarm.