Funny cycle

Stizzle

Since I turned 30 my cycle comes when it wants to, it use to come on 28 days on the dot never fails around 11:58p. Now it bounces from 27, 25, 26, 23, 26, 24 and only one time on the 28th day since 30 (I’m 34) lasting 5-6 days and it use to last 4-5 do I still count 14 days after 1st day of my period for ovulation or what? It’s driving me crazy.