Bleeding after or during intercourse

I've been on birth control for the past 6 years and haven't had this problem. Last month I missed the pill and had intercourse with my husband, out of fear from falling pregnant I took plan B. I continued on my birth control pills as scheduled and started bleeding a week early (I know this is normal or expected ) my problem is that it's Been exactly one month since taking planB and almost everytime we have inter course I'm bleeding. It's a normal color of blood, not brown or light pink like others have described. It's red like you cut your finger red. I'm not bleeding during the day or at night. Just after intercourse, enough that it'll get on the sheets or all over his penis. I'm a little concerned. I'm thinking PlanB messed my cycle up and this is possible break through? Any suggestions or similar experiences?