Should I take a test?

So me and my new boyfriend had unprotected sex, we got plan b the day after as it was an accident and in the heat of the moment neither one of us were thinking about it. Well, the second time our condom busted, (about a week and a half later) , so as before I took plan b. both times it made my period start a week early, as it said in the box. but it's been 2 1/2 weeks and I just had some brownish discharge? I've been having cramps and feeling kinda I'll in the mornings... guess what I'm wondering is do I test, just to make sure? I just feel like I'm over reacting . I'm young-ish and can't speak with anyone else about it. thanks ladies!