weightloss in pregnancy.

hi ladies!

so today I had a follow up from Fridays er visit. my primary care Dr is concerned about my wbc being high. well she also mentioned since being pregnant I lost weight. which I do know I did June 6 I had a on appointment and weight was 263 today it was 260. she said she's worried I am losing weight. I made a call to my ob to see if I can get in to talk to her but haven't heard back. should I worry?! I'm 18 weeks tomorrow.