My period was late, about 2 1/2 months i went to the doctors early in peice to ee if i was pregnant, cmae up negative, still no period, had been feeling sick and tender breast the whole time, have been trying to get pregnant for 9 yrs, 2 days ago i got extremly bad cramps in lower stomach and in my back and buttocks, not usual period pain then i got extremly heavy bleeding with large clots. they werent the normal colour, this doesnt feel like a normal period could i have been pregnant and have miscarried and should i go to the doctor