Hi, I have gone through your question. Light headedness is common in early pregnancy because of the hormonal changes in the body which leads to low blood pressure. Gestational diabetes mellitus in last pregnancy is a risk factor for developing gestation diabetes mellitus in this pregnancy. For detecting it, you need to get your fasting and post prandial blood sugar levels done now, if normal then go for repeat testing by glucose tolerance test in second trimester. Spotting in early pregnancy can be due to haemorrhage around the foetus( subchorionic haemorrhage), threatened abortion, or ectopic pregnancy. I would suggest you to consult an OBGYN specialist to get properly examined, get an ultrasound done to confirm the diagnosis and get further management accordingly. Hope you found the answer helpful. Wishing you good health. Regards, Dr Deepti Verma