Cycle 1 Clomid- longer period?

Hi

Has anyone else’s period been longer on Clomid? It’s my first cycle - was prescribed Clomid as I wasn’t ovulating regularly. It is usually 5 days, but currently on day 6 with no sign of it stopping. I’m wondering if it is because my lining has built up from anovulatory cycles (although I have never actually missed period).

Thanks for any advice

C