I am still a bit confused about how this pill works....

I took the pill 8 days ago ( 08-04-19) within 12 hours and i havent had any type of bleeding, been feeling lots of on and off light cramping.

The problem is that i had sex 2 more times after taking the pill and believe he came inside...

Also for what is says i dont know if i was already ovulating..

Have to add i am 5'7 and i weight 197lbs, i heard that plan b aint very effective after 176lbs.....

Please dont be rude, its my first time using this pill and i didnt know anything about it.