When did you get pregnant with preseed?

How long were you conceiving before you got your bfp while using preseed? Just got some but I have irregular cycles so I’m not sure when to use it... I got a nasal body thermometer and started using it today to track my ovulation hopefully. I get my period every month but normal it isn’t the same week. also has anyone specifically with irregular cycles got pregnant with preseed? And if so do you have any tips??🙂 thanks