Birth control & pregnancy

I work third shift, and usually take my birth control around the time I go into work (10pm). I've been sick this past week and have been off work, and I've been a little late taking my bc. One night I didn't remember till 2am, I've taken it at 1130ish, and even took it at 830 one night I felt absolutely horrible and just wanted to sleep. Could me taking my birth control at these different times make it any less effective? I'm only asking because I have had unprotected sex all last weekend, and once this past week.