I am currently taking Tri-all-Sprintec pills. I’ve been on them for about 5 months or so. My boyfriend and I haven’t been using other protection besides my pills. I went on vacation recently and on July 4 I completely missed my pill. I didn’t take that pill until today (July 16). On July 5 we had unprotected sex. I was half a day late taking it on July 8 and we had unprotected sex twice the following day. Starting July 14 I started getting brown discharge. No odor at all. Based on what I’ve said, do you think it’s implantation bleeding? Or is it just a side effect of missing a pill?