The Urine pregnancy
test are not fool proof. It is better to wait and watch for few more days (2 weeks) and get an Ultrasound
scan for pregnancy. The best way the positive signals start with it if we see a foetal heart beat.
Do not get stressed out now. There is no point in doing the HPT further. All the signs and symptoms that you narrated are only probable or possible reasons to doubt pregnancy but the ultimate thing is finding foetal heart beat in the scan.