I Have Missed My Periods Since Last February And Recently

I have missed my periods since last February and recently I indulged in dry sex with my partnerwhereof during the act his penis wasn't covered but my vagina was covered by my clothing and since during thesedays I had been undergoing strenuous exercise to reduce belly fat . And since last 2 days I m having some sort of muscular cramps in stomach accompanied by pains at thighs and legs and shoulders. I took the sugar test for pregnancy and it was negative. I just wanted to know that am I pregnant?