Is Spotting Normal During Pregnancy?

You are going through breast engorgement. This might occur when your breasts get loaded with milk and become sore and uncomfortable. As your body enters the process of your baby, it makes more milk hence your breasts become full very fast. Try warm compresses, gentle massage, and expressing some milk regularly to help with the discomfort.

DELAYED PERIODS and BACK PAIN may indicate PREGNANCY.. Take a PREGNANCY TEST to confirm.. ORAL CONTRACEPTIVES or STRESS may also cause DELAYED PERIODS.. Consult a doctor if symptoms persist..

Puberty can start at different ages for different people and there is a wide range of what is considered normal. 
The ability to have children (reproductive maturity) usually occurs after the completion of puberty when the reproductive organs, such as the ovaries and testes, have fully developed. For most individuals, this occurs in their late teens or early twenties. However, it's important to remember that everyone's development timeline is different.

You might be suffering from Polycystic Ovary Syndrome often mentioned as a possible cause of irregular or missing periods and pain in the lower abdomen area. One of the most common symptoms of PCOS is pain, as well as irregular periods. This is caused by the imbalance of estrogen and progesterone, some hormones that the ovaries produce. For the treatment of PCOS, engage in exercise, lose weight, and follow a healthy diet.

It is not typical for your period to be a bit late after having sex. Stress, changes in routine, or even normal hormonal shifts could all lead to the delay of your period. If you're concerned about being pregnant, you can use a pregnancy test to clear your worries. 

BASED on your hCG level, YOU could be pregnant... However, the scan DIDN'T show anything yet... Your last period was on 16th October, so it's possible you're just a little over 2 weeks pregnant... You should wait a few more days and take another test... If it's positive, schedule an appointment with your doctor.