so I've been taking lo loestrin fe for about 4 years. I'm not super good about taking them. sometiems I'll miss one or 2 in a row. however, I'll always double up and get back on track. But here recently my fiance hasn't been pulling out..at all. on the 16th day of my cycle he didn't pull out. my question is, even though I'm on birth control and have been for a while, what are the chances of me getting/being pregnant?