What Are The Chances Of Conception Inspite Of Taking Sunya Pills?

Hi i would like to ask you a question im on sunya pills in dec i had my period on the 7th and on the 14th i had sexual intercourse but i was on my pill and he didnt ejectulated nothing and then 28th and 29th i missed the pill and on the 31 st dec my period came and started a new pack of pills on the 31st when the period came i made an ob and i noticed that the other day i had nothing only just few drops is it normal ? I took a pre test on the 10th and it said im not pregnant .. On the 7th i met this boy again i did a hand job and he pre cum he didnt touch my vagina with his penis but i dont know if he touched his penis and then he touched my vagina i cant remember im so worried im always searching on the internet my breasts are tender from the 10 th dec and it suppose between the 24 th and 27th i will have my period im still on pills and on the 20th is my last pill should i worry ?