first and foremost, COULD pregnancy be an option (have you had unprotected sex?) how long ago did you take your pregnancy test? what was the date of the start of your last period?
if you are concerned, as you should be about your body, i would call your physician and talk to them. if you do not have a family doctor, you could always try a planned parenthood or another facility much like it. i would try and get bloodwork done by a doctor to completely rule out pregnancy, as hpt are not always 100% accurate.
hope this helps, keep posting updates!