A Question about my period - Please Respond -THanks

hello

i didnt have sex with my bf but he ejaculated on my panties during my period ( i had a tampon )
that was 2 months ago
what are the chances of getting pregnant like that?
i did get my period, but it was 10 days late, but it was quite heavy as usual
and now my last period came 10 days earlier and it was very light, then dissapeared for 2 or 3
days and came back...very light again

i never had regular periods, though.

i do not have any simptoms, but im worried i migh be pg, should i be?