No positive opk

Emily • I`m 22 and married to an Airman. We live in Spain and have a 3 year old daughter! We are pregnant with baby #2!!!
I'm on cycle day 16 and still haven't gotten a positive opk and I test 2+ times a day!!! The only time where I saw any kind of line was a few days after my period ended, but it went away. Gosh, I'm so tried of this 😭😭😭 conceiving my first happened so fast