Why does bleeding happen in pregnancy?
The doctor told that the symptoms of bleeding in pregnancy should never be ignored. If a pregnant woman is bleeding, she should immediately inform her doctor about it. Irrespective of the month or trimester, it is not right to ignore bleeding in pregnancy.
Reasons for bleeding in pregnancy

Dr. Gayatri says that in the first three women, there may be bleeding due to the risk of implantation or miscarriage. If there is a risk of miscarriage, this danger can be avoided by taking rest. To see the baby in the womb, the doctor may ask for an ultrasound and see if the baby’s heart is beating or not. Bleeding in the second and third trimester of pregnancy is not common and should be discussed with a doctor immediately. Bleeding on the first day of menstruation closer to the date of delivery can be a sign of labor pain.
bleeding in the first trimester

Ectopic pregnancy (in which the fertilized egg implants and grows outside the uterus, such as in a fallopian tube), implantation bleeding (which occurs approximately 10 to 14 days after conception when the fertilized egg implants in the lining of the uterus), according to Mayoclinic is), miscarriage (pregnancy loss before the 20th week), molar pregnancy (a rare occurrence in which an abnormal fertilized egg develops into abnormal tissue instead of a baby) and problems with the cervix, such as a cervical infection Bleeding can occur in the first three months due to cervical inflammation or growth on the cervix.
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in the second and third trimesters

Possible causes of vaginal bleeding during the second or third trimester include impetigo (premature opening of the cervix, which can lead to preterm birth), miscarriage (before the 20th week), or intrauterine fetal death. placental abruption (when the placenta – which supplies nutrients and oxygen to the baby – detaches from the wall of the uterus), placenta previa (when the placenta covers the cervix, resulting in severe bleeding during pregnancy) ), premature labor (in which there may be light bleeding).
Reference:
https://www.mayoclinic.org/symptoms/bleeding-during-pregnancy/basics/causes/sym-20050636#:~:text=Light%20bleeding%2C%20often%20mixed%20with,professional%20for%20an%20accurate %20 diagnosis.