I had da same thing going on and I went to the ER bkuz I started bleeding more after days passed and I had a vessle that was bleedin which in some cases its normal for prego ladies but they also suggest to be extra careful bkuz it can be a sign of miscarriage. I was tld by my ob not to have sex until the vessle stop bleeding. Jst be careful and if it gets heavy go to the ER.
Anytime you have bleeding during pregnancy you need to call your OB or Midwife. However, it's not uncommon to have spotting after intercouse during pregnancy because the cervix becomes sensitive and engorged with blood vessels. Any irritation to the cervix can cause you to start to spot. But, I would still contact my doctor just to be on the safe side.