Hi there. Pregnancy tests are pretty accurate so wouldn't assume pregnancy. Our hormones, thyroid and various other things can affect your cycle. It would be doubtful to feel any type of movement from a fetus based on what you've written as most first time pregnancies, women don't feel any type of movement until 17 weeks-- I was 20 weeks before I felt anything. So, realistically, very doubtful you are pregnant. If you are concerned about irregular periods, I would see your doctor to discuss this. good luck
Go to a doctor and get it tested as pregnancy tests will not be very accurate all the time