Irregular cycles after MC. TTC

How are your cycles like? Mine became longer. Had natural MC end of OCT 2017 @8weeks. Had my period in december. My cycle eversince was 35,37 and now 40. Thought i was gonna get a BFP but AF was just delayed :( TTC for number 2. How will I know when is ovulation in the future? Anyone in the same boat? Anyone of u get pregnant eventually? (Im still breastfeeding my 2 yo)