stomach pains

So i stopped taking my pill around October time and I have refused to take any contraception due to my stomach always hurting when they seems to be hormones in my system . So I didn't have a period until 22nd Dec 2016 but today I'm starting to feel sick and got sharp pain on my right side of stomach, has anyone had this before ? I did a pregnancy test and it was negative , also I had a ultra sound at hospital and was told I'm okay around 2 months ago and that's when I decided to quit the contraception. Helppp