Need Opinions

So a little back story, I was on the ERRIN pill while I was breastfeeding and that worked well. I stopped breastfeeding and needed to switch to a more effective birth control. I got my period from August 24th-29th and during that time I didn’t take any birth control so my body can get off the ERRIN before starting my new pill. I started the pill the day after my period ended and yesterday (9/1) had sex. Now I am worried that I didn’t give the pill enough time to kick in to be effective. What do you guys think? Should I be worried because I am STRESSED!