How'd you find out you were pregnant?

I had a test in my drawer, so I decided to take it for fun. I just knew it was going to be negative because it'd been 2 months since I've had intercourse. And I'd been getting my "menstrual cramps" all week. So no doubt this was a just for fun test. It came out positive! I was like, hmm.. this one's messed up so I joked about it. The next morning I bought a two pack and they all came back positive. So to think, this all started as a joke, and it became an oh, you're 6 weeks pregnant!