HI THANKS FOR YOUR QUESTION.
If you are virgin which means you didn't had sex with any body,then you cannot be pregnant even if you have missed periods for many months.
So forget about pregnancy
Menstrual cycle at bebning (when girls start having their periods) and menupause (when period stops) are irregular due to changes in hormal level.
So irregular periods
rather than missed periods is your problem,which will get settled in few months time.
Your other problems that is bloating
,abdominal cramps could be due to kidney infection
(inflammation of stomach) and hopefully will get settle in a week time.
Hope I answered your question