Confused💔

Good day ladies , I would like to share my story with you all and also need some advice. Last year I got pregnant twice First the doctor said it was blighted ovum pregnancy (Baby is not growing)so they had to terminate ,Second time I had an ectopic pregnancy which I didn’t know off ,got my left tube removed (Went for emergency surgery) So now am only left with one tube . Am trying to conceive again . Saw my period on the 13th -to 17th February and according to the App I ovulated on the 25th of February. Had sex 4 days in a row before my ovulation and 1 day after ovulation. When must I track my ovulation exactly (Am not sure how many days is my cycle 😭