Missed my period on the pill??

Aleesa
I'm trying not to worry but.. I'm worrying :( this is my first time on the pill; I started taking birth control (Lolo) last month and have been taking in constantly every day at the same time. Whenever my boyfriend and I did have sex we used a condom, except for one time last week where we didn't, BUT I was on my placebo pills and we ended up putting a condom on Half way through.. Just wondering if it's normal to miss a period when you're first on the pill? I'm kind of worried.. Also been pretty stressed with school lately. I have been having all the symptoms recently of my period.. Just no period