Help!!! Could I be pregnant?

So I have had 3 previous pregnancys and 2 live births but never had implantation bleeding, I had sex during my fertile window now I'm experience spotting it's like brown discharge more than spotting even. I'm mid cycle so still got about a week till my period. This is crazy!!! We used a condom but it was pitch dark so who knows if it was on right.... Anyway.. Is it possible I could be Preggo???