Unprotected intercourse during the fourth day of my period, I am not sure did he finished in me

I had unprotected sex on 28th February during the fourth day my period, w're  not sure whether he cum inside or not so I took the morning after pill within 24 hours. I had the MAP in January before by the way. And my period delayed almost 6 weeks, I had the pregnancy test and it was negative, my breast feel sore few days ago and a lot vaginal discharge but still I am so worry that I will get pregnant, what should I do? :(