Here are a few methods you can use:-
1) Monitor Your Menstrual Cycle: A normal cycle is somewhere between 28days plus minus 7 days. You monitor your periods regularly then you will be ovulating at around 14th day from the beginning of the last menstruation.
2) Check your Basal Body Temperature: You can keep track of your body temperature by using a basal body thermometer. Usually after ovulation a females BBT increases to somewhere around 0.5 degrees. Usually you should measure it in the morning.
3) Cervical Wetness: Some women can feel the cervical wetness which is maximum during the ovulation. You can check it by properly washing the hands and then gently feeling the cervix with one or two fingers. While doing this you can also feel the consistency of the cervix and whether it is open or not.
4) Mittle Schmerz: It is a pain of ovulation which occurs specifically during ovulation. Few women can feel that.
5) You can always use the ovulation kit with your convenience as they are pretty accurate.