i took a pregnancy test and he came negative now its postive , should I be worry ?

If I was you I would take another one tomorrow morning as your hcg levels are more apparent in the morning to confirm

No, you should only look at pregnancy tests at the time stated by the instructions (eg. after 1 min), if you leave them for a while then they usually turn positive x

How long after you toon the test did it turn positive. If you read them after too long the result shown isn't accurate. That's why they advisein the instructions to check after a certain time

The results are only accurate in the allotted time.

Did you look at the test results in the allowed time frame? It is important that you look at the pregnancy test in the time frame. I would recommend you buying a test that writes out whether or not you are pregnant instead of the line one to get a more accurate clear answer.