Почему у меня нерегулярный менструальный цикл в 21 год?

It sounds like you had an ectopic pregnancy, which is a serious medical condition that requires prompt treatment. In most cases, surgery is necessary to remove the pregnancy and prevent life-threatening complications. As for removing both tubes, this may have been necessary depending on the extent of damage or scarring. It's important to follow up with a gynecologist or reproductive specialist to discuss any concerns or questions you may have about your fertility.

Period symptoms don’t usually include stomach aches, but it seems that’s what you’re going through. Weakness, dizziness, and fatigue may be low iron in the blood or hormonal changes. Ensure you take a healthy diet consisting of green leafy vegetables and fruits. Apart from that, drink enough water and have a good sleep. Should these symptoms persist, seeking medical attention for further investigation is vital.

If you used a condom that didn't break or leak and you had sex on the 8th day of your cycle, there is a low chance of getting pregnant. It's usually difficult to conceive at such times in the menstrual calendar. However, remember that no contraceptive is entirely foolproof although using it correctly reduces the risk significantly. If there are any unusual signs or symptoms, it may be a good idea to do a pregnancy test to be sure.

irregular periods are common and can be caused by stress . A healthy diet and exercise can help regulate periods . hormonal imbalances or certain medications can also affect periods .If you are concerned, speak to your DOCTOR. 

In my opinion, you need to consult a gynecologist for detailed diagnosis. Breast pain on the left side may arise from different sources such as breast infection, injury and inflammation. Prompt diagnosis and treatment is necessary to prevent any complications. If you have any concerns, do not hesitate to see a doctor.

On average, ovulation takes place around 14 days before your period up to the start of your next one. On the 1st of September, you were still in the risky day period. Symptoms that occur in the early stages of pregnancy can be the absence of periods, dizziness, and tender breasts. For the best results, a pregnancy test is the most reliable option. 

You might be having genital herpes which can develop painful red bumps in the area of the vagina. You should go to a gynecologist or an STI specialist in order to get the right diagnosis, and treatment.

Yes, a healthy lifestyle, diet, sleep, exercise, and less stress can contribute to preventing cancer. Improving immunity can also help. However, there are no guarantees.