Little worried

I'm on birth control and I'm usually very very cautious when having sex. If I don't use a condom, we use the pull out method. I know it's not 100% or anything close to it.

I was supposed to start my period today and I usually start it in the morning or early afternoon. I've been moody, cramping and everything the last week or so but still no blood to be found.

I am very very worried right now. I plan on running to grab a test in a few min. Has anyone else had a problem with their period coming a day or so late while on tri-sprintec?