So I had taken 4 pregnancy tests. All very very very faint positives. FRER and Walmart cheapie. No clue when my period was due as they are irregular. My lines never got darker over the course of two days.  I started spotting pink only when I wiped about 15 minutes ago and there was light pink tissue in the toilet & no spotting at all when I wipe now. is this most likely a chemical? I am a mess and have never experienced one before