Irregular cycles!!

Tiamour • Princess born April 2011. Prince born February 2016
Ok, so I'm very confused! I have irregular periods and I have only just started tracking them this year, as I was on birth control for 2 years previously,  my partner and I are currently TTC #2! Last cycle I changed my length to 43 days as that's how long my last cycle went for, this month i have '12 days until I'm due' and started my period today but had 3 days previous of spotting. 
Do I change my cycle length to suit this month? Thanks 

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