New to this? I was pregnant in march & Dr said I'm not ovulating??

Elizabeth • 3 ectopics(2003,2010, 5/2018) 1 m/c (3/2017) no babies :( 35 still trying
Hey ladies! I feel sometimes it's better to turn to u then Dr's because you have been thru so much and Dr's arnt always right. So I was pregnant in March but lost it due to a m/c so I thought I'd go to a new Dr to see what's going on and he did a 21 day progesterone and it was only 6.9 so that means I didn't ovulate?? I have regular periods so I figured I was ovulating every month. I am 34 with one tube because of an ectopic but I thought if u have a period on time every month you are good? Anyway when I start my period my Dr is putting me on clomid to help. Anyone know why I wouldn't ovulate?I thought if u have pcos u don't have regular periods?