Hello Anon! Thank you for writing today.
The birth control pill works by stopping sperm from joining with an egg (fertilization). The hormones in the pill stop ovulation. No ovulation means there's no egg hanging around for sperm to fertilize, so pregnancy can't happen. The pill is 99.9% effective. Since you are taking it as prescribed, you are protected even with full intercourse. Taking emergency contraception when it's not needed can cause unnecessary side effects like an irregular cycle, cramps, nausea, and other discomforts. Read the information that came with the emergency contraception so you know what to expect. Keep taking your pills as usual and your cycle will sort itself out.