No period dont know what's going on


So I'm all over the place I posted a while a go saying that I came of the pill in November withdrawal bleed into first week December and I bled from 11th to 27th of January which was stupid and exceptionally long so on here it says should of had my period 5 days ago no show and negative test I did my first ovulation test on the 6th at 11am threw given advice it was not quite a positive for that so I took another at9pm and was lighter and by next morning it was gone no line atall I dont know what's going on why would I bleed for 15 days and then nothing now my periods are usually only 5 days I'm so confused