Period skipped a month, now it came back black and very light for longer than usual??!

Hi guys

I have PCOS, not pregnant by blood test, negative on the prolactin and thyroid and my pap is normal. My period has been regular for 5 years now. Not on birth control. I got my period is on December 2nd and then I skipped January and got my period on February 2. It has now been 10 days I have had light bleeding, constantly dark and brittle. Me and my husband have been having unprotected sex since December trying to conceive. What do you think is going on?

Usually my cycles are 28 to 30 days and they last 7 days and very heavy.