There are many reasons why periods get missed like stress, lifestyle changes etc. If you think it is because of pregnancy, I suggest you to visit a gynecologist and get some pregnancy tests done to confirm it. 

The probability of the conception through precum when a cyst present varies from factors such as the position and cyst size, overall health status plus time sex happens. visit an expert gynecologist specialized in reproductive health for proper evaluation and management of such a case.

It's normal for your period to be late after unprotected intercourse, as the body sometimes reacts this way. It's common not to show any symptoms for a week. Pregnancy symptoms might appear later. Stress or changes in your routine can also delay your period. If you're concerned, taking a pregnancy test in a couple of weeks can give you a clearer answer.

While some discomfort during menstruation is normal, severe pain or other symptoms such as sudden hemorrhage requires a doctor’s attention. It necessary to visit a gynecologist for better evaluation

To start with light household chores after a hysterectomy and avoid the strenuous activities. For the first weeks, do not lift anything more than 10 pounds to avoid putting stress on this area of surgery. Reintroduce activities such as cooking or light cleaning gradually, but never bend, stretch or lift heavy weight. If you feel uncomfortable or tired, listen to your body and rest. Generally, 6 to 8 weeks after the doctor’s recommendations a gradual return to normal activities is prescribed.

Certain medical professionals may perceive you as slightly old for childbirth at 35, although it is feasible for several females. Irregular periods or difficulty conceiving are among the symptoms you might experience. The fundamental factor is that the quantity and quality of your eggs diminish as your age advances. However, you need not worry since there are various methods such as fertility treatments which can be used to enhance your chances of becoming a parent.