help!

me an my boyfriend had protected sex. he used a condom an didn't cum. the condom slid up a bit when he pulled out but didn't slid off just up maybe an inch or two . we got worried about precum. which I didn't know if it could leak from bottom of condom. So I took plan B for a extra precaution . I'm not on birth control. this was during my ovulation week. What's my chances of being pregnant . today is now 2 days before my predicted period an there is a tint of pink in my discharge every once in a while . should I worry?