Ok so I've been on birth control for 2 months and I've been good about taking the pill at the same time every night. This morning my boyfriend and I decided to try having sex now without a condom since it's been 2 months and I'm also ending my period, i think i just finished this morning. But the thing is I've been on penicillin since Tuesday and it says that it might cause a decrease in the effect of the birth control pill, so now i'm worried. Should i get the morning after pill tomorrow morning? Will it still be effective even though i'm still on this antibiotic for like 4 more days? What is my chance of getting pregnant considering i'm on the pill and am ending my period??? please let me know asap i'm kinda spazzing out! THANK YOU!!!