3 days ago I took 4 hpt all positive.I went in to my obgyn the next day she did a blood test it was negative.today out of curiosity I took the last to and they where positive.could something be altering them

The blood test could be wrong, or the blood samples were not handled correctly.

It happens. Human error plays a large part.

If you've gotten 4 positive hpts, that's what I'd base things on. A pregnancy test checks for the hcg hormone. The only thing that produces that hormone is pregnancy.

In other words, I'd say congratulations are in order. :)

That's what I was thinking thanks for the reply

That's what I was thinking thanks for the reply

You're welcome.

Good luck. :)