Well all of a sudden I'm irregular . . .

Okay so has this happened to anyone else? My cycles have been normal, period coming every 18-21 days. Now all of a sudden, as we start the TTC journey, my period has decided to be all over the place. Had breakthrough bleeding, two days clear, then a light period for six days (my period is never that light and it's never six days it's usually 8-9), then per opk I ovulated, and six days after finishing my period I'm bleeding again. Legit what the hell is up, ugh! It is so frustrating. Has this happened to anyone else? Ideas for getting back of track w my cycle? I know I'm ovulating (opk and ultrasound). I hope this doesn't make it harder to make a baby, ugh.