Lost weight??

I have an appointment in like 4 days so ill ask my doctor then...but in the meantime, anybody lost weight without trying? I'm not sick. I couldn't tell I had lost anything...I was even afraid to weigh myself thinking I'd gained too much. I was 168 pre-pregnancy so I'm in the overweight weight gain scale anyways. (15-25 lb total) I got up to 173 at my 16 week appointment and just weighed myself today at 19 weeks and I'm down to 169... So even with a lower weight gain goal, I'm not gaining enough. Just hoping I haven't somehow hurt my baby... there's been a lot of stressful things going on lately from my husband's health to my SIL whose baby was stillborn at 23 weeks...so I don't need another thing to stress over unnecessarily. But on the other hand, if this is going to be a problem, I'd rather know now. I'm just going to try to eat a little more but idk what else to do...I thought I was eating plenty already.