During breastfeeding, pregnancy can be confirmed by checking blood HCG or ultrasound in the hospital.
The absence of menstruation during breastfeeding does not mean that there is no ovulation, so it is recommended that contraception be used during breastfeeding. Generally speaking, it is recommended that a normal normal delivery be followed by another pregnancy after about one year, and it is recommended that a cesarean section be followed by another pregnancy after an interval of two years, so as to help the uterus to recover.
If you are not taking contraceptive measures during breastfeeding, to confirm whether you are pregnant or not, you need to go to the hospital for a blood test to see if the HCG value is significantly higher, or ultrasound to see if the intrauterine gestational sac is indicated, and if there is any fetal heart tube pulsation, if there is, then it means that you are pregnant.
Therefore, in order to confirm the pregnancy of breastfeeding women are recommended to go to the hospital blood test HCG or ultrasound, pregnancy will lead to a decrease in the amount of milk, but this is not a diagnostic criterion.