How can I know if I'm properly suppressing testosterone if blood work is not available to me?

-18 years old, started Estradiol Enanthate monotherapy 22 days ago.

-4mg weekly for my first two injections, bumped it up to 5mg weekly for the third.

-I feel more fatigued than usual, but I've been getting much better sleep, and I'm less irritable or impulsive. My chest is sore and I can feel firm lumps underneath it. Semen is slightly transparent.

Another question I had is how long do unopened vials usually last before expiring, so I know how much to stock up?