Fingering after fellatio

Heyy... Recently on 24 oct, me n my bf had sum fun 2gthr.. I gave hm a blowjb fr 2-3 mins n he didnt ejaculate... There ws only some lubrication liquid coming out frm his penis which went in my mouth and i swallowed it.. Aftr dat we kissd n i guess i swallowed evrythin... He then fingered me n b4 doin dat i licked his fingr.. He den insertd his fingr in my vagina n startd doin it.. One thing s seriously bothering me.. Cn i get pregnant because i licked hs finger n he insertd it in me, considering d fact dat i previously gave hm a blowjb n dat lubrication liquid cud hv sum sperms in it...??? M due to hv my periods in a couple of days... Also i saw sum blood on my panty yestrday..!! Is it a signal dat my periods r goin to start or is it of sumthin else?? PLZZZZZZ DO RPLY.. M REALLY TENSED..!!!! PLSS RPLY ASAP..!