Hello dear, I understand your concern. In my opinion the weakness and tiredness is a usual finding to be seen in pregnancy. But the reasons like low HB ie.,anaemia,low blood sugars like hypoglycaemia etc. So I suggest you to get the HB and blood sugars done to rule out anaemia and hypoglycaemia. Nothing to worry as hypoglycaemia might be a routine finding seen in pregnancy due to continuous supply of glucose to the fetus. So you need to take 3 meals and 2 snacks per day to prevent low sugars. Also rule out anaemia and take iron rich diet and iron supplements. Healthy nutritional diet is advisable in pregnancy like vegetables,fruits,iron rich diet like green leafy vegetables,dates,zaggery,liver,figs etc. Calcium rich diet like milk and milk products. High protein diet like meat,egg etc. Practice antenatal exercises or walking daily. Nothing to worry it will subside. Have a happy pregnancy. Hope this helps. Best regards....Dr.Srilatha