I was given antibiotics 5th march the same day i took my last pill and started my 7 days break. I was with my boyfriend 8th march who ejaculated on my anus, we had no vaginal contact at all. I cleaned it up making sure i wiped it all towards the back. I was then reading online as there was nothing in the leaflet and realised that the antibiotics can affect my pill. I had my period 9th march on time as normal and expected. I know I was a way through the pack and the pill (microgynon stops ovulation) and even if it did happen it would have been way before that and that i was getting ready to shed my wall. Is there any risk that I could be pregnant given that my pill may not have been fully effective and we had no vaginal contact at all.