pregnant on birth control?

Tyra🖤 • hi! i'm 17, i love dogs, and i consume way more boba than what is considered healthy (with no regrets)
In December of 2016, I missed the last pill in my packet and I had sex a couple days later while I was supposed to be on the placebo week of the pack. However, I'm kind of worried that I could be on my period because I know that you're protected during your placebo week but like I said, I missed the last pill for that month's packet. 
On top of that, I haven't had any symptoms of pregnancy whatsoever but I'm not gonna lie, I'm a little afraid to take a pregnancy test. Is there any way I could be pregnant despite having no symptoms?