Advice please

Hi

I just need to get some other point of views about my period.

In October 2017 I had my period for a whole month, went to my doctor got tested for everything they could think of and even had a virginal scan to check my tubes and womb lining everything came back normal. In November I had a normal 7 day period, December I had a period for 1 day then it stopped. This month I’m on my 9th day 😩I haven’t got a clue what’s going on and I am not on birth control. Help