Could I be pregnant?

This might sound really stupid, but I'm getting really paranoid... So I've been having sex with my boyfriend and am afraid I might be pregnant. We use condoms, and I'm on the pill, but I've gained a few pounds, and pee a lot.. I usually wouldn't be worried, but I was off of the pill for about a week while waiting for a prescription refill. Does this sound like anything anyone has experienced when discovering they're pregnant?