Hi There, I Had Sex A Month Ago The Day

Hi there, I had sex a month ago the day before I was supposed to be fertile according to my schedule. We used protection but he said some of it leaked out the bottom of the condom. I am now 4 days late on my period and am experiencing a white discharge (that dries yellow) but it doesn't seem different to me. This discharge has been normal before I started having sex. Am I possibly pregnant? I haven't experienced any early symptoms. I am 96lbs and still have not noticed a baby bump. It's been a month.