moodAnother of the common pregnancy symptoms that are very similar to how many women feel leading up to menstruation is moodiness. It may be nearly impossible to differentiate between typical PMS irritability and weepiness and the irritability which is normal during pregnancy. This symptom may be noted soon after conception, due to rapidly changing hormones. It may also be a sign of impending menstruation, menopause (if you’re in your 40s) or just plain stress.