Bad odour and very faint pinkish discharge!

Help me!! I have no idea whether to believe I am very late or early pregnancy.. I've been off of birth control since sept 2016 and have tried going back on for two weeks in April. I never finished the pack and stopped taking it because I didn't want the hormones to make me irritable all the time. It sounds dumb as hell but I did that.. anyways, my period without the hormones is a cycle as long as 50-55 days. A month and a half, usually, apart from each other. I faintly bleed 50 or so days ago and now I'm faintly bleeding and have a foul smell this month.. I broke up with my ex in the middle of June and we had unprotected sex a few times. I don't know whether to believe I am pregnant or it's just my body trying to regulate itself again without the hormones. I work all weekend and can't wait until Monday to go to the doctor.. should I buy a home pregnancy test and see? Also I have absolutely no symptoms at all.