Ovulation tests

Erica
So me and my husband have been tcc for about 8 months but nothing. Part of the problem has been ovarian cysts but now that is all taken care of we have still not gotten pregnant we have been taking a stress free approach so I have done tracking but that's it.  I am wondering if it is time to go out and buy the ovulation kits.. I know nothing about them do you use them everyday or do you just take them around your fertile week?? Any advice suggestions would be great..
Thanks 
Erica