do i need plan B

ladies I have a query and I was just wondering if you could answer it ,

so I've just finished my first pack of 21day contraceptive pills and I'm on the 4th day of my 7 day break so I am currently bleeding .

I went to see my boyfriend today and because I haven't seen him in awhile I treated him with a blowjob - he never fully ejaculated he just precame . after this he pulled his sweatpants and underwear up and I went to get a drink , I also througly washed my hands with soap and water then went back with him. when I went back I realised he had a very small wet patch on his crotch area on his sweatpants which was precum I touched it and I forgot to wash my hands , around 5minutes later after cuddling and watching TV I went to change my tampon. My worry is that precum may have gotten in my vagina when I went to replace my tampon (self applicator )

I know that there is a very small chance of getting pregnant if a man touches you with ejaculate on his hand so I was just wondering if this would fall under the same circumstance ? will I be okay? do you think that there is any chance of a pregnancy here and would my pill be effective by now ?

no hate please - just asking a question, thank you ! :)