I need opinions please!

Ok so I think I have a yeast infection so I will start treatment tonight but when I went to use the restroom this morning I was spotting. I only spotted when I wiped and nothing was in my underwear.. I had no spotting later so far. I am on cycle day 19 and had sex last Sunday early morning and the wed prior and both were considered my fertile period. I'm due for my period next Sunday! Is this a good indication that I could be pregnant? I have no other symptoms...