Regarding period delay. But it's own!

Hello mam/sir My period is not coming with its own I have to take medicine (norestherone) from 4 months to induce my period I have taken ipill in the month of feb and april. I had last proper intercourse on 13 th feb and after the intercourse I had taken ipill and got bleeding from 18 feb to 22 feb and I have induced period 3-4 times after taking norestherone because my period is not coming by its own. I want to know that I had 5-6 times oral sex with my partner last oral sex was on 2 may and I had beta hcg test on 22 may which was negative . After negative test I took norestherone for 5 days and got period from 24 may to 29 may first 2 day's period was heavier after that I got lesser with brownish flow and lasted for 5-6 days. After that i had taken 2 upt test which was also negative but this month also my period is delayed so i had started primoult n for 5 days 3 tab is any chance of pregnancy. Is my test is reliable. Why I am not getting my period but it's own