Hello there. Thanks for posting your question. your question doesn t provide clear information as to what exactly your concern is. However, irregular bleeding and positive and negative test results, swollen tummy, makes me think if I should be considering pregnancy. Definitely yes, you need to do another urine pregnancy test and if it turns out positive, you must go to your doctor for a ultrasound scan and a clinical examination to see if you have had a miscarriage or a threatened miscarriage. If it is negative, I would still suggest that you see your doctor for evaluation of polycystic ovarian syndrome which causes irregular bleeding and also for other hormonal tests that can cause erratic bleeding like thyroid and prolactin ( both are hormones ). Hope this helps, take care!