Then you had +ve with the OPK before? If have, should assume ovulating lorz..
After my m/c, i intially wanted to go for such tests too, but my gynae said no need, coz can conceive natually and if go for sperm test, usually won't give very satified results T_T
I used OPK, recently I just bought the thermometer too, wanted to start taking when my 1st AF comes (of coz if never come better coz means BFP haha) >D