Will O Rh- and O Rh+ blood cause pregnancy complications at 37 weeks?

It could be normal DISCHARGE or an STI.. Get tested..

Periods can  be delayed not only due to pregnancy but also other factors like stress and anxiety, etc. Try a pregnancy test if you're concerned.. if the test is negative then visit a gynec for irregular periods problem.

If you miss your period for 4 months straight and notice a bloated bigger belly, you might be pregnant. Alternatively, it might be due to hormonal imbalance or other medical problems. To confirm, take a home pregnancy test. If results are negative, visit a doctor for further investigation. 

When spotting during your ovulation, this is usually not a matter of concern. But if the bleeding does not stop or worsen, or you feel pain and discomfort then it is recommended to visit your gynecologist. They will be able to diagnose and treat if needed.

It is vital to ask for advice from a gynecologist or a specialist in menstrual illness if you have any issues pertaining to your menstrual cycle.

Taking Unwanted 72 after unprotected sex can help in case of pregnancy. It might have to be mentioned that young people should take it within 72 hours. Since the usual menstruation time has passed and in the meantime, you've already got your period, the symptoms you may develop are mostly related to the bleeding. Spotting or changes in the menstrual cycle are the main issues after taking the pill. 

Having sex without protection on the second day of your period usually means there is a decreased chance of becoming pregnant. During this time, the egg is less likely to be ready for fertilization. However, it is not impossible to get pregnant so if you want to be extra safe, you might want to take emergency contraception within 72 hours just in case. 

It's good that you are taking steps to recognize things early. Dexamethasone is used to help a baby's lungs develop in case they are born prematurely. Premature means the baby is born before 37 weeks of pregnancy. You don't need to worry about the baby having problems with this medicine if they are not born until after 37 weeks.

There can be several reasons why your period flow may be decreasing at the age of 22. While it's normal for menstrual flow to vary from person to person, few reasons like hormonal changes, birth control methods, medications, etc. can affect menstruation.

If you've had sex without protection, you are at high risk of getting pregnant, so don’t miss taking contraceptive pills but it is better to talk to your doctor once

Since you characterized the symptoms, it could be possible that a STI has occurred. It is advisable to consult a gynecologist or urologist immediately and get tested so that the appropriate treatment can be administered on time.

While it's less likely to conceive right after having your period, it's still possible to become pregnant at any point in your menstrual cycle, including during the days immediately after your period. 
If you've had unprotected intercourse and missed a period, it's important to consider the possibility of pregnancy and take a pregnancy test to confirm.