Chances of getting pregnant this month?

Kris
I'm currently on cd15 and my af is due May 16. On cd13 and cd14 I had pink then red then brown spotting (not enough to fill a tampon at all). Today it's perfectly fine but when I have sex it feels like my cervix is low and my walls are super soft. Is there a chance of getting pregnant this month? I've never spotted before my period like this and it's definitely not my af.