21 day cycles?

Callie • 26 yrs old. TTC #1 since 2007.
Hey ladies..Im new here but been TTC 8 years. I have pcos so I've been on metformin 3/4 months my last 3 cycles were only 21 days but this cycle I'm at CD 22 and no signs of period but I've been sleepy a lot..hungry..and hot flashes galore!.. so I started using emerita progest cream 40 mg yesterday trying to lengthen my cycle to 28 days..but we are actively trying. let me know what u think?...