Is it normal to spot on and off of my period but not come on fully :/

Hi everyone, I apologise in advance for the detail. I started bleeding very very faintly about 3 weeks a go, then I stopped. I started a little heavier about a week a ago but now it's stopped completely again? Is this normal? I don't think I'm pregnant, we've been trying for about a year but i dont think i am becauseI've got pcos. My periods are all over the place and very long (sometimes 5 weeks) because of the pcos so it's hard to tell whether I'm late or not. Any input would be massively appreciated xx