Having hard time getting pregnant , when should I seek help?

Hello everyone 👋🏾

My fiancé & I have been trying all year . My periods been out of whack starting February. I’ve been February 29days,March 30days,April 30days,May 33days, June 35days,July 30days,August 30days, September 28days, October 28days & November 28days. Yes been just an mess so it’s been hard trying to track the days I’m ovulating . My periods last 5-6days. Today I’m 2days late. I’ve been cramping since November 30th Saturday and only notice brown pinkish discharge and back pains. I did take an pregnancy test you to see and that came back negative 😕. Now I’m starting to feel like I can’t get pregnant because we’ve been trying and trying and trying . Should I seek help ? (Please no rude comments because I’ve seen some commenters get smart mouth with people who only want to see what everyone suggests.)