The cause of a missed period may range from stress, weight-related changes, hormonal imbalance, or chronic general conditions. I would need the guidance of a gynecologist to know the exact condition and seek the required treatment.

Implantation bleeding is a common type of bleeding that occurs at the beginning of pregnancy. It is characterized by light bleeding that happens throughout the implantation of the fertilized egg into the uterus. Seeing a gynecologist is always crucial to ensure other possible causes of bleeding during pregnancy are ruled out. 

It is always good to remember that these symptoms are caused by many factors. It is advised to see a gynecologist to determine the gross check-up and diagnosis. The symptoms presented here are likely to suggest a hormonal imbalance or a base medical disease lying underneath. 

It is possible to detect pregnancy before a missed period but the highest accuracy is designated after a missed period. It's possible to obtain home pregnancy tests that are accurate after one missed period. Please visit a gynecologist.

The first positive pregnancy test is usually available one week later after having a missed period. On the other hand, a wait for at least two weeks after sex is necessary for the pregnancy test to show accurate results. Please consult a gynecologist or obstetrician who can give you further recommendations

Sperm usually travel from the vagina to the fallopian tubes within 6 and 10 hours after having intercourse. Fertilization happens in these tubes. If there is an egg in the fallopian tube, something which may happen within minutes of the sperm's arrival, fertilization can occur. A visit to the gynecologist should not be avoided in case of any fertility issues.

You should make an appointment with a gynecologist in case of enduring pain in your uterus after urinating. This can be a symptom of urinary tract infection, endometriosis, or some other conditions. 

The reason for delayed periods may be other than pregnancy, for example, mental disturbances, body being with travel and some hospital procedures, hormone disorders, or other reasons. You can always consult a gynecologist for further details. 

If you engage in unprotected sex and you have a fear of getting STDs, you need to be examined now. It is possible that even though you are on PrEP and you have consumed Doxypep after the encounter you may still contract a sexually transmitted disease (STD). It is advisable to see a gynecologist, or a urologist for your test, and a future plan on how to protect yourself.

It is also not unusual for the menstrual flow to last longer than the usual 3-7 days, and if it goes on for 15 days, it may mean there is something wrong with you. It is advisable to set an appointment with a gynecologist who will examine your situation and suggest effective treatment.

It is not abnormal to have menstruation for a longer period but if you bleed for 15 days, it is a matter of concern. So, you should consult your gynecologist. This is oftentimes a sign of hormonal imbalance or another condition. 

The first signs of pregnancy range from missed periods, fatigue, nausea, vomiting, frequent urination, tender breasts, and mood swings. You should make an appointment with an obstetrician or a gynecologist if you think that you may be pregnant. 

Based on the information provided the possibility of impregnation from pre-ejaculate in this situation is quite small, though not impossible. As to point that emergency contraception is the best when taken immediately after unprotected sex should be stressed. You could start by seeing a gynecologist or a reproductive health specialist to discuss the issue and possible methods of emergency contraception.

Prolonged menstruation and whitish discharge are indicative of several states like pregnancy, different infections, disorders of hormones, and a thyroid disease. The best move is to visit an OB-GYN or a gynecologist for a thorough medical examination and prescription. 

According to your sonography record, it is seen that you may have polycystic ovary syndrome (PCOS). This particular disease is considered a hormonal disorder and affects mainly women of reproductive age. The symptoms could be irregular periods, acne, and weight gain. It is wise to see your endocrinologist or gynecologist who specializes in this condition if you have it.