Am I pregnant?? i need some advice / help!!

Already had my period (Jan 3-8, 2018), 2days after im done with my period, i had sex with my BF but he didn't come inside me (actually it take 2 mins before he come- i did BJ on him) then after 4days (which is Jan. 14) im bleeding again and its not just spotting, cause im totally using a pad and it almost fill it up on the first day of bleeding then on the 2day i got heavy bleeding with somehow little clot, now on the third day im having a medium bleeding still have some little clot.. what does that mean??Am i having an Implantation bleeding? or ovulating bleeding?? (my next period supposed to start Jan 31) actually im planning to go to a doctor but i just want to have an idea about this (my period is regular btw).. thanks