I don't know if this would be the same as your situation. But in my case, I had been having a lot of problems with migraines and stuff so the doctor put me on two types of medication. So I started taking them. Well when I went to go do a mri, I didn't want to have it done because I hadn't started my period and I didn't know if I was pregnant or not. So they gave me a blood test that was negative. Well, long story short a week or two later I still hadn't started and I was getting concerned, so I took a hpt. 2 of them and both of them came out positive. Doctor didn't believe I was pregnant but when I looked up medication online I discovered it caused false positives for blood tests. So, maybe that is the case with you, maybe your medication makes it come back negative or maybe you don't produce enough hcg for it to show up on a hpt. Are you past your regular period time? If so, I would have the doc do a blood test just to be on the safe side. Hope this helps! Take care and good luck.

:d thank you very much. I believe I will get a blood test done. Thats what I have been thinnking all along.