Wow-I'll be touched if my hubby ask such question on my behalf
By the way,
(1) How many cycles have you been trying the ovulation sticks on?
(2) How long is her cycle (counted from day 1 when menstruation first started)?
(3) How many days did you test?
You mentioned the tests were came up negative. Was it a light second line, or was it only one line. With ovulation sticks, some people never get second line as dark as the control line, but it should get darker over the few days around her ovulation. Try to test from day 10 the next cycle and it'd be better that she doesnt use first morning urine.