I switched from a 35 microgram pill back to a 20 microgram pill this month because the 35 microgram pill was giving me all sorts of side effects I did want. While on the 20 microgram pill, I forgot to take two pills during the first week (Friday July 22 and Saturday July 23). I took two pills on the 24 to catch up and had sex about an hour after. I started bleeding on Monday like a period. I've had mild breakthrough bleeding from missing a pill in the past but not longer than two days and not this heavy. Could it a combination of going to a lower dose and missing two pills? Should I be worried about a pregnancy risk even with the bleeding?