Help! Stopped my seasonique 3 weeks ago!

Hayley
I stopped taking my birth control about 3 weeks ago and had my period the day after. And no I am having cramping in the middle of my uterus, sometimes cramps all over and had a sharp twitching pain on my right side of my uterus. My boobs are really sore and are starting to get white pimples around the nipples. Could I be pregnant?!