Day after pill.

So, I was on one of my highest fertile days during my cycle and stupidly had sex so I got the day after pill and took it with in an hour after having sex. Ive taken plan b before it and made my period start a few days after each time (3 times) its been almost a week and it hasn't started yet but I'm cramping so I'm assuming its getting ready to start or something. I'm on birth control but forgot to take the pill the day before and last time I did that I got pregnant with my now almost 3 year old. Plan b is like 85% effective if taken in the right time and correctly. Should any part of me worry that it wont work. Before you guys lecture me, I know we should of used a condom. I was dumb and just wanted to hop on the dick. 😂 now I'm regretting it. Not ready for a second kiddo. Love being a mom but one is good enough for now.