I'm 17 and not looking to get pregnant. My partner and I had sex around the time my period was due (around Feb. 10), but you can never really tell with me. My period has always been very irregular. I was waiting for my period and about a week and a half later, I started spotting very lightly for about 4 days. I've been extremely stressed this past week, and I'm sure that's not helping anything, really. I'm very irritable, and I have been since I was due for the period I missed. Now, I'm just wondering, could I be pregnant? Has anyone ever experienced anything like that?