Hi Acria, congrats! It sounds like you are pg I hope you find that you are soon!
It's definitely possible to safely lose weight whilst being pg, providing it's done in a safe manner directed by your GP. I read in a "Pregnancy&Birth" magazine that it is actually healthier for a baby if an overweight/obese mother is able to maintain or lose weight during the pregnancy, rather than a slimmer mother stacking on the kgs.

Talk to your GP about it when you have your blood test and they'll be able to help you for sure
Good luck with everything!

xx