I'm 12 weeks gone yesterday, I do go for ultrasound scan, the doctor s…

I'm 12 weeks gone yesterday, I do go for ultrasound scan, the doctor saw my baby at 6 weeks then tile me to come back in 4 weeks and at 10 weeks he said he couldn't see the baby but there's an heartbeat.... now at 12 weeks I feel weighty in my lower abdomen, my nipples are severely paining me, I have no appetite and I'm weak