Ladies I have a question!

Corrinne
My cycle is pretty irregular and I have been on Lo Loestrin Fe for almost 10 months. I am sexuality active and take my pill at the same time everyday, give or take 10 minutes. Every once and a while, once a month maybe, I forget to take it until four or five hours later but I always remember that day. Last week when my period was supposed to start, we had sex. I felt a little bit of cramping and bled a tiny bit after we were done. I figured it was the start of my period but it never came.   We use a condom 10% of the time and he's never came inside of me. My period, according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>, is 5 days late. I recently, December, changed the time I take my pill so I figure I'm still getting regular. I also recently, two months ago, had a unitary infection and took meds for it.  I was just wondering if I had anything to worry about? I am 17 and about to graduate so I really don't need anything extra to worry about. Please reply!