advice please!

Been ttc for 5 months with no luck...I have 3 children already. This is with a new partner who also as 2 of his own. I usually catch really really easy so for me to be trying with no luck for 5 months is unusual for me. I have a horrible feeling I am not ovulating. I have been doing cheap ovulation sticks and all are always negative. I woke up today with a urge to pee and the urge as been there all day. I think I have an uti could this be linked to no ovulating does anyone know? Thank you in advance