If your period is normal and there is no delay, you will have a pregnancy reaction when you are 40 days pregnant, with symptoms of nausea, vomiting, weakness and drowsiness. Pregnancy reaction is a series of symptoms caused by the increase of hormone secretion in the body during the fertilization of the egg. If you have a pregnancy reaction, you should have an ultrasound to check whether the fertilized egg is in the womb. If the progesterone and HCG values are normal, it means that the fetus is developing well, so you should rest in bed during this period, enhance nutrition and pay attention to fetal preservation.