My menstruation is normal all the time before, this month menstruation is measured very little, how

Before menstruation has been normal, this month menstruation is very few, can consider is ovulation caused by bleeding, vaginal bleeding will be very small, how to rule out the possibility of ovulation can consider is the occurrence of threatened abortion. If there is no sex life at ordinary times can consider is the recent eat a lot of cold cold food, or abdominal cold caused qi stagnation blood stasis, menstrual blood volume less.