What causes early ovulation?

Question

According to glow I'm suppose to ovulate on CD 23 (yesterday) but instead I'm pretty sure I did on the 19th ? My cervix is closed and firm and on Tuesday it was soft/open with ewcm .

Answer

I'm in the same boat. Glow says i ovulated yesterday-cd17 but I'm pretty sure I ovulated 12/1-cd12. I'm not sure what causes early ovulation though. I'm sure stress can cause it as well as other things.