I Came On My Menstrual Dec.5,2016 It Lasted For About

I came on my menstrual Dec.5,2016
It lasted for about four days to be exact and usually it last 6 days so the two extra days I was spotting alittle pink blood with discharge I had sex on dec.11th which I was still spotting my partner ejaculated in me and we kept going about two or three days later I started noticing my vaginal area becoming dry so I knew something was wrong I had caught a yeast infection which was most likely to happen because blood and semen don't mix so now I have a yeast infection and I'm having pregnancy symptoms at the same time could I be pregnant right now which would mean I conceived two or more days after my period