How many weeks were you when you found out you were pregnant?

There's a possibility I could be pregnant. If I am, I'd be around 8 weeks pregnant. I'm 10 days late. But I don't want to take a test until Saturday just to be sure it's accurate. And I HAVE had a period since the last time I had sex (like shortly after the last time I had sex). But now I'm 10 days late this month, gaining weight, and hungry all of the time. Just wondering what's the likelihood of me being pregnant. Should I have found out before now? should I have missed the other period also to begin with? I just don't want to waste money on a test and then have my period to start the next day, ya know?