I always used to have
Irregular period but since I got married I started getting regular (2 years regular period). Now again for past 6 months irregular periods. This time for 2 months no period at all. I went to the doc for check up if I am pregnant. The test is negative and had regestrone to get my periods. On 10th day after medicine I got spotting for just 2 days but no flow. What shold I do??

I think you should call your doctor again.

Did he do any testing to determine why you aren't having a period? Typically, it indicates that you are not ovulating which progesterone has little to do with. Sure, that hormone will start the process of getting your period, but there may be bigger issues involved here.

It sounds to me like you need more attention from your doc.