I've been on Loestrin 24 fe for about a year now. I take it regularly and consistently, but vomited a few hours after taking one pill of this month's pack. I'm on the second day of the placebo pills now, and I did not have a period last month at all. My boyfriend and I have been having sex, without using condoms, for 5 months and everything has been fine, but I'd like some reassurance. Could missing that one pill in the first week of pills cause me to be pregnant?