Whether am pregnant? Slight bleeding.

I had my period on 2nd march nd ended on 8th march.. My last period was on jan 6th before that i jad on 9dec, my period is somewhat irregular. .. Me nd my bf were foreplaying on 9th march.. he tld me to to give handjob and even he touched it. After ten min he started fingering in my vagina.. Before that he was rubbing his hand on my undergarment and den he went inside and started fingering .. M scared now whether i could b pregnant as i don't know whether his hand was wet or not.. As while touching his penis i felt some sticky like.. Don't knw wat was that.today 5th April i had slight bleeding.. M confused whether it is implantation bleeding or period.. Can implantation bleeding happen after so many days....or it is due to stress dat spotting is happening