I didn't know. We had just gotten back from a cruise to Mexico, and I started getting really sick. I was scared that I had picked up a bug while on vacation. I went to the docs twice, and they couldn't find anything wrong with me aside from the nausea, and when they asked if I was PG I said no. They never questioned it. I thought maybeeee... So I decided to take a test. Mostly so that I would know that wasn't why I was feeling sick. To rule it out LOL. It was weird tho cause when I got my BFP, I wasnt surprised at all.