Losing weight in pregnancy

Hi! Iv not long found out I’m pregnant I’m around 7 weeks, iv always been a bigger woman but I want to stay healthy during my pregnancy, I just found out today I have pregnancy diabetes and high blood pressure, I have my 1st midwife appointment on Thursday to discuss it, I’m looking for advise on what I can eat, I don’t usually eat breakfast but have been making myself eat, I’m just not sure what I can eat with having diabetes. Tia. ( posting anonymously as haven’t announced pregnancy yet)