Effectiveness of Ginette 35.

Hi guys!

I've been on Ginette 35 for a little less than 3 weeks for contraceptive reasons.

The other night during intercourse, the tip of the condom broke off inside me, however my boyfriend pulled out before finishing. I am concerned about precum residue on the torn off tip...

I would like to know how long you have to be on this pill before you can be certain that it prevents pregnancy, as I cannot seem to find this answer online ?

Hope someone has an answer, thank you!