Lost weight

Hi ladies, I'm feeling a little worried. I just weighed myself this morning and I've lost another pound and a half since I last checked a couple weeks ago. I'm currently 8 weeks, 3 days pregnant and I haven't been vomiting, but I guess I've been eating less with the nausea. Is this something to be concerned about? Want to make sure my little bean is getting what they need! We saw a healthy heart beat yesterday at our ultrasound and baby was measuring 6 days behind my dates.