I would say if you are unsure get it checked JIC but i had a similar bleed in my 1st pg after dtd at 36wks and it was nothing. I did go and get checked out though as i am rh neg so i have to have any bleeds seen to incase i need an anti D shot. All was ok. i was told that it was normal to be very sensitive during pg and maybe we had been a little rough etc. It scared us and we did not dtd until after dd was born even though we were told we could but gently i am 35 weeks along now and have had nothing like it this time. Maybe just ring your ob or hosy and see what they think but if it was me after my last exp i would not be too worried. HTH.