Hi, im 18 years old and im concerned to whether or not i should take a home pregnancy test or not. My last period occurred on july 8th or 9th. And i was supposed to start my period on aug. 9th but i haven't started it yet. I had protected sex with my boyfriend on july 28th and im pretty sure nothing happened. I've always had an irregular period but the past year or so i thought i was starting to get on 30 day cycles but now this is throwing me off and im not sure what to think or do.