I've been taking Sprintec for years. Never got my period the first time round due to my hormones adjusting. You were two weeks in so you are covered, shouldn't be pregnant. You should have your period by that fourth placebo the next time round. Continue taking it like you are and you'll be fine. Try not to stress yourself out, it makes everything worse.
Keep in mind that you should have been instructed to wait a month before intercourse so the pill had time to work through your system if that was the only form of birth control used. Also, a guy doesn't necessarily have to ejaculate because there are still fluids that are passed and if no condom was worn, precum is a likely possibility. With that being said, our bodies have a funny way of working, and if you freak out enough and believe you're pregnant, your body could very well start showing symptoms even though its a false pregnancy....just a psychological standpoint. You can take a home test, but ultimately you should contact your gyno, or if you're embarresed or in a bind, go to Planned parenthood for a test, but there are lots of factors that can sway your period.