Does a small amount of menstruation affect pregnancy?

Patient's question:

Please ask if I have had very little menstrual flow every time I have my period this past year, with the second day being slightly heavier, and by the fourth day, only a little pink on the sanitary pad. It ends after four days (previously it was heavy for the first two or three days and lasted six days). Does this affect pregnancy?
Follow-up question: For about a year now, one week before my period, my breasts become very sore and cannot be touched (which has never happened before). Is this important? Also, how can I check if my fallopian tubes are blocked?

Doctor's answer:

Menstrual volume is affected by pregnancy. Menstrual volume refers to the amount of blood flow during menstruation being less than normal. It is often caused by factors such as blood deficiency, qi stagnation, blood stasis, cold congealing blood vessels, and phlegm obstruction. It is generally considered that a menstrual volume of less than 30 milliliters is classified as hypomenorrhea.
Causes of reduced menstrual volume in women
1. Multiple induced abortions or improper abortions: If you have undergone multiple induced abortion procedures or used improper methods for abortion, it may lead to damage to the endometrium and the occurrence of cervical adhesions, resulting in reduced menstrual volume or even amenorrhea.
2. Congenital underdevelopment of the uterus or ovaries: Congenital underdevelopment of the uterus or ovaries can cause a decrease or insufficient secretion of hormones by the ovaries, leading to insufficient endometrial hyperplasia or only a small amount of endometrium shedding, which in turn results in reduced menstrual volume.

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