Freaking out, pink discharge?

I recently began having yeast infection symptoms and some weird opaque pinkish discharge. I've read online that pink discharge can be an early sign of pregnancy and I am freaking out. It is accompanied by a fishy smell and itching/burning. I had unprotected sex at the beginning of my cycle although he pulled out and I took Plan B afterwards. I'm also on birth control pills that I take regularly. I took two First Response home pregnancy tests today and both were strong negatives. This made me quite a bit relieved until I realized that I'm still six days away from my period. Help!!! What do I do??? I'm really concerned because the lack of protection wasn't exactly... consensual.