Hi, here's my problem. I went on holiday & forgot my pills, duh! ( marvelon) I started taking them as soon as I got back, but about 3 days later I saw my bf ( he wasn't on holiday with me) and in the heat of the moment ( I missed him

) I forgot & had unprotected sex. The problem...... I now have a respiratory infection & was prescribed biaxin. I read that it can cause birth defects if taken while pregnant,it is still 6 days till my period is due. The question....... Will a pregnancy test be accuate this early? I need to start these pills but if i'm pregnant I don't want to risk birth defects. My breasts have been kinda sore the past 2 days, but could that be pms?