Is there a chance of pregnancy

On the third day of my period my bf and I were taking a soapy hot bath together and he was wearing underwear I was wearing bathing suit bottoms (this was at a waterpark hotel) I kinda grinded on him for 30 seconds underwater and he was hard but was there a chance sperm could of gotten in me? I had a tampon in and he didn’t ejaculate at all but is there a chance precum maybe got in somehow?