Losing weight

Steph

I know I'm probably over thinking this and I know it's fairly common to lose weight in your 1st trimester due to morning sickness and loss of appetite... But I thought I'd weigh myself this morning and I seem to have lost quite a bit of weight... Between 3-5 kilo's ish give or take and that's got me slightly concerned about baby even though I am eating my 3 meals and a snack before bed... No am I just over thinking this or should I say to my doctor/midwife that I feel I'm losing too much weight...?