 [ Symptoms ] how can i learn about hfa asthma inhalers [ Disease ] in addition to what the other contributor said it is possible that you are pregnant and the hormone is not yet strong enough to show up on the test i went through the same thing when i was pregnant with my second child the hcg hormone was not strong enough to show up until i was already 4 or 5 weeks late another thing to consider is is you have always been irregular then pcos is a possibility too if i were you i would consult with an obgyn soon at least that way you can get some real answers and maybe some stress relief