Anyone else have a 40 day cycle???

Just started using this app and it told me my cycle is irregular because I have a 40 day cycle. I used to get the Depo shot for 2 years and I have been off of it for 2 years almost. When I first started Depo I bleed every day for 2 years. When I came off of Depo I didnt bleed for 1 year. I finally started my period again 1 year ago and at first it wasn't regular, but the past 6 or so months it has been on time with a 40 day cycle. Can anyone else relate to this?? I want to know what my chances of conceiving are... thanks in advance!

Ps!: I've already had baby number 1(girl <3!) & started the depo after I had her. My cycle was never fully regular to begin with and I still conceived her!!