Possible reasons for the missed periods would be conceiving or certain hormone troubles. It would be advisable to seek a gynecologist diagnosis and treatment as a first step.
 

the reasons for abortion are usually genetic anomalies or hormonal imbalances. In case you go through difficulties like vaginal bleeding and abdominal pain during pregnancy, see your obstetrician or gynecologist. The doctor will inspect the situation and decide if the miscarriage is finished or not. Immediate medical advice needs to be sought to rule out other possible health issues.
 

A girl can get pregnant, if she ovulates and his semen penetrates her. Birth control needs to be used to avoid unplanned pregnancies and stop the spread of STIs. Consult a gynecologist or a sexual health expert if you have any issues or queries about your sexual health.

If you have missed the second period after taking Plan B with a negative pregnancy test, it is unlikely that you are pregnant. Periods may be irregular since hormonal changes take place after Plan B. Make an appointment with a gynecologist and get the right diagnosis.

Women who have fibroids often experience pain during the pregnancy. Your sister needs to have an appointment with her gynecologist to figure out the best plan. The specialist in this area, also known as a maternal-fetal medicine specialist, can give extra counseling and management for this condition at that time.

If you have exceeded the due date since your last visit with an obstetrician or midwife, you better call. They do tests to check on you and your baby's health, and options to induce labor if the case comes. I suggest that you see an Obstetrician or Gynecologist for a thorough evaluation and guidance.

A faint line on a pregnancy test may lead to one assuming that they are positive but next is to verify with a doctor or obstetrician. 

I would recommend you to see a gynecologist and an fertility specialist to address your concern. The hemorrhagic cyst may complicate your chances and there's a need for you to go for evaluation and treatment from a specialist. Get relief knowing that clinical intervention and effective treatment can increase your odds of conception.
 

If you have worries about your reproductive health, then you need to go to a gynecologist. They may be of assistance in dealing with menstrual problems, fertility, sexually transmitted diseases, and menopause. 

This may be a sign of bacterial vaginosis. This condition is frequently the result of unbalanced bacteria in the vagina. A gynecologist or an obstetrician and gynecologist specialist should be consulted for the right diagnosis and treatment.

If you have finished a full course of doxycycline for chlamydia and a negative result on testing for the infection, it is generally safe to have sexual intercourse again. You should go see a gynecologist or a urologist for a comprehensive approach and recommendation on safe sexual activity.
 

It will be your OB-GYN who will figure out the exact date when conception took place. She will provide further guidance during your pregnancy. It is of crucial importance to see a competent specialist, if there is any question of a problem related to pregnancy.

Missing periods can be caused by several issues ranging from pregnancy, stress, weight changes, hormonal changes, and certain medical conditions. It is important to go to a gynecologist who does a comprehensive physical examination to establish a conclusive diagnosis. 

If your menstrual bleeding continues for 15 days, it is pertinent to visit a gynecologist without further delay. This may be the symptom of more serious health issues, e.g. fibroids or endometriosis.

Seek medical consultation from a specialist in case of any infertility. These may include endocrine problems as well as congenital tract obstructions. The fertility specialist can examine you and prescribe treatment options accordingly.