Hiya stephani. By being 'off your period' i presume you meant the 1st day of your bleeding in the recently concluded cycle was 1 week ago. If so, you are right is unlikely to be a pregnancy
. However, if you are a couple of days awry & the 1 week was judged after/or on the day the period 'finished', then there is a chance of it being an 'implantation' bleed. Else, is it possible the coitus was forceful/traumatic & that could have cause a mild tear/bleed? YOusay since then you have had dime sies of this discharge..is this post further intercourse episodes or de novo? It may be useful to wait a week or two & then do a B-Hcg
test on yor blood/serum just to be safe & /or go in for a gynec appointment. Should you wish or feel comfortable letting us know where you live, would be happy to recommend one in your area. Cheers...@ wit's end ;-) Hoping you are fine & all well soon!