Opk/fertility confusion

Brooklyn • Elementary Teacher and Mama. Baby dust to all!!! Mom to two boys 💙
I have this horrible fear about not being able to ovulate. I've only been TTC for 4 months so it's not a big concern right now but WHAT IF after months and months of hoping I find out I'm not fertile???
When you take an opk and you get a negative but two lines show up (just one is faint) does that mean at least a little LH is detected and you are most likely a fertile person? I have yet to have a positive opk on both first response and clear blue digital. Only test once a day.
Thanks for friendly advice and encouragement 😄