i haed my reglour period but i think im 5 weeks pregant and it was my first time haveing sex , and he haed a condom on notting went rong but latle im haveing head acks and my back hirts , but iv also ben doing a lot of sit ups cause im chubby and my top of my tummy is going in but the bottom part isin going in much so inno if im just stupied or something but i think im pregant . and im onl.ey a teenager so could it also be growing pains or something, right something so i no cuase im really upsit and i dont wanna worrie anymore about it !