Bbt 33-35 day cycle regular 5day period

How many days before ovulation should I start tracking then I don’t know when my ovulation week is sometime it’s 9 days af sometimes 15 days after af last 6 months I tracked with the strips had perfect results but never got pregnant so I wanna change it up to just bbt for couple months if that doesn’t I want to try Geritol if that doesn’t work then I’m just gonna tell hubby maybe if we just stop trying maybe it will happen then our families don’t even like that are married and living together so I don’t think they want us having kids but we both been feeling like July will be it for us his brother is being shipped out for a year and he said he wants to come home as a uncle and I’m trying I really am