What month are you in if early yes if late usually no are you eating
Possibly anaemia. Check your Hb levels.Commonest is iron deficiency.
low blood sugar..or high blood sugar.... just take it easy and dont worry dizzy spells and hot flashes do happen when your pregnant just test your blood sugar and see if thats what it is if not call your doctor or midwife and talk them about it good luck.. and congrats...