ovulation worry

Hey ladies, so we are only on cycle 2 of TTC our rainbow baby after a m/c at 9 weeks last year. first month we just DTD every other day but this month I wanted to try and pinpoint ovulation just so I could see if it was around the same time my apps were telling me it should be. I've been using the clear blue digital ones and started on the day it told me to for the length of my cycles (25 days) but I've now used up all of the test strips and still not got a positive on them. Has anyone else experienced this? I'm now panicking that I'm not even ovulating. Don't know whether to carry on with them next month or not. this whole TTC is really taking it's toll on my mental health already and we've only just began!😂😂