Am I Pregnant ??

So Like I'm Only 16 Right? & Anytime I Have Sex, Which Is Rare , We Use Protection. My Boyfriend & I Had Sex A Week Ago 3 Days Before My Period Was Supposed To Start. 1 Day Before My Period Started. I Spotted Just A Little Of Blood. Now My Period Is 5 Days Late & I Have Had Severe Pain In My Stomach. Am I Pregnant? Please Help .