I have pelvic pain all the time especially on period, i had 8 days of brown bleeding then two weeks later a very heavy and painful period ?

Many options : Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections & hormonal changes can cause spotting. If there is a concern for pregnancy then do a home pregnancy test . There are many options available to help regulate the menstrual cycle. Schedule a visit.

It's possible: If your period is late, it is possible you are pregnant. You might consider taking a home pregnancy test - they are very reliable - or visiting your doctor.