Lost weight while pregnant?

Courtney • I`m 24. Married since May 11th 2014. Pregnant with baby #1 !
I've had really bad nausea and vomiting for the first few weeks and I weighed myself today and I've lost 3lbs since getting pregnant! I know I'm supposed to be gaining weight, not losing it. I've been eating normally but can't keep much down. Has anyone else had this issue? Or have tips? I'm 9 weeks pregnant. 

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