Okay so I've been on the pill for three months, and I missed a pill one time in the third week. During that time, I had sex without a condom. It's been four days since and I just researched that I should double up pills, but I had skipped that pill. Should I go back and take it now along with the regularly scheduled ones even though it would be 4 days late and I'm on the period ones? I am on my period right now if that's relevant. More importantly, how big is the increased risk of pregnancy? Should I be worried??