11 weeks and losing weight?

Abi

I've just reached my 11 week mark yesterday and since my doctor weighed me at 7 weeks I've lost 3 and a half pounds l... I haven't vomited throughout my pregnancy and have occasionally nausea but it's only in the afternoon and it only disappears when I eat... starting to worry! I can't understand what is happening and I've been eating more then I ever did before falling pregnant

Has this happen to anyone else?