What Does Irregular Periods Means When Trying To Conceive?

hi we've been ttc since february, before that i've always been very regular with my periods but since february my period came late, (10 days) then the next one came extremely late (17 days late) and i'm not sure if i can call it a period, it has lasted almost two weeks and has been very light but has a dark brown color to it, is this normal?