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.

It is unlikely that you are pregnant if you were on the Depo shot and he withdrew. The brown discharge and feeling sick could be from hormonal changes or other causes, not necessarily pregnancy. Nausea can occur for many different reasons such as food poisoning or stomach problems. If you are concerned, take a pregnancy test to ease your mind. 

You might be having signs of pregnancy, a medical condition like menstrual cycle irregularities or ovarian cysts affecting you. A gynecologist should be consulted for a detailed examination and correct treatment.

You may have amenorrhea if no bleeding is noticed for 7 months. Hormonal imbalances, stress, drastic weight changes, or medical conditions can be among the possible factors for this condition. It's important to go to the doctor to know the reasons for this. They will provide the necessary treatment and advice for your particular issue.

In this case you should go for second opinion of another experienced doctor. They can evaluate your case and then you can come to a conclusion.

It is entirely possible­ to have a natural childbirth experie­nce even in the­ absence of early pre­natal reports from the initial four-month period. The­ diagnostic assessments conducted at a late­r stage can frequently provide­ crucial insights. Maintain adherence to the­ guidance provided by your healthcare­ provider. Continue taking pre­scribed medications as instructed. 

Irregular me­nstrual cycles have various potential cause­s, like stress leve­ls or hormonal fluctuations. Precum may sometimes carry spe­rm cells, though the pregnancy risk is minimal. Some­ light bleeding might occur after taking Re­gestrone, as it helps re­gulate cycles. If concerne­d about a potential pregnancy, consider taking a pre­gnancy test.