Kate please dont freak out after u read what i have to say ok? just check with ur doctor and to ease your mind have an ultrasound.
I was pregnant before and had the first ultrasound at 6 weeks. There was a hearbeat!! I felt pregnant, my boobs hurt to death, i couldnt wear a bra without saying AYYY!!
Later after a couple of weeks, my boobs just shrank, in fact one looked smaller than the other, i thought i was exaggerating, but ya, my husband saw them and agreed. I got scared and went the same day to see my doc and the doc was like "you little girl! u worry a lot! come and u will see there is nothing wrong!"
I sat and started to pray, and 5 minutes later the doc said "i cant find the heart beat and the baby is smaller than what he should be"
I told him all sad and crying that I know well my body and I knew something was bad. But just to make something clear.. I was having morning sickness as well and lots of nauseas all day long and all those symptoms disappeared aas well.
I hope there is nothing wrong with this but if I were u I would talk to my doc, and even if he says its normal, i wont sleep until check that lil bean is fine.
Keep us updated please dont get scared i am just letting u know what happened to me, i might be wrong with regards to your case.
GOod luck hun