Short Duration Bleeding with Clots

The symptoms you're experiencing could be due to various factors. If you suspect pregnancy, taking a home pregnancy test a few days after a missed period is recommended for accurate results. Since your cycle seems irregular, you might want to test around your expected next period or about two weeks after unprotected sex. 

While normal white discharge is common in many women, but if it is heavy and with odour then there may be an underlying infection like yeast or bacterial vaginosis, which is a form of vaginal infection. It is essential that you see a gynecologist or an expert in sexually transmitted infections so that you can get the right diagnosis and treatment.

Masturbation does not cause pregnancy. Check with your gynec for your periods.

It is quite normal to have a slip in the monthly cycle even if you didn’t get involved in any sexual activity. Stress, drastic weight changes, or changes in your daily schedule can affect your period. If the missed period is the only symptom you are experiencing, everything is probably okay. Your periods should return in a few weeks without any intervention. You need to take it easy and eat a balanced diet; also do some physical exercises and ensure to get enough sleep.