So, usually my boyfriend and I only use the withdrawal method as contraception (not ideal, I know). Sometime in the week of the 13th-18th of this month he accidentally came inside me. This was the point when I realised that we had to use another form of contraception, so I booked an appointment to get a prescription for HBC. I'd planned to wait until my period came to be sure I wasn't pregnant before I started taking it (it's due on the 8th of October) My appointment was today and when I came home I had completely forgotten about waiting until my period came and took the first pill today. I'm unsure as to whether I should continue to take the pills or to stop and wait for my period so it's certain that I'm not pregnant. If I do this, will the one pill have an effect on the time my period will come? My cycle is usually every 30-33 days, and if it makes any difference, the brand is Microgynon 30.