This is my second pregnancy, my first was a misscariage. I am 6 weeks and felt cramps and bloating but my doctor tells me everything is ok, and they did an ultrasound but all they can see is the sac. He saids it may be because i am still early in my pregnancy.I dont know if i should be worried. Since i already had a misscariage i am afraid it will happen again. Specially because he only saw the sac. Is this normal?