Could I be peragnat if I had sex the night before my period come and my period only last a day and ahalf and my period wasn't do till the 23 but came on the 19 what could this mean

I wouldn't take any chances.. the short period you encountered could have been an implantation bleed.. take a pregnancy test to be sure. And I'm not certain, but your hcg levels might not be high enouph yet to be detected by a home test, so if the first one comes up negative, wait a week, then take another one.. but the best way to go is always to get a blood test.

I'm no expert, but that's what I have been told.. I'm on here looking for advice in the same area. It's scarry stuff.. good luck!