I had unprotected sex on august fifth and i took plan b right after that. Then i got my period on august 19th. I had sex using a condom that didnt appear to have any breaks or leakages on september 9 and i have still to get my period. I have all the signs like acne, sore breasts and period like cramps that are on and off. Ive also been on metrogel and oral flagyl as well as medications to treat yeast infections. I know plan b has effects on late periods and antibiotics can too. Im just not sure if i should worry and take a test now.