am I pregnant?

So I've been taking birth control pills for a month    (December 2016 )then after that month a week passed and I didn't take it because I had to go get some more pills from the pharmacy I had ran out and so then I just normally started taking my pills again the next Sunday of January(2017). I had sex without a condom and he also pulled out every time ( I take my birth control at night and I've been taking it different times at night throughout the month of January because I've been so busy at night ..) I had sex on these dates: Monday Jan 9 around 2 am, Tuesday Jan 10 around 1 am, & Monday Jan 26 around  3 am. 

My period is 2 days late should I be worried ? Am I pregnant? And is it possible that I can entirely miss my period because of my birth control?  I'd greatly appreciate it if someone would help me ! (: and respond ((((: