Hcg level

Hayle • 5 yr old daughter. 1 👼🏼 1-23-19. Ttc baby #2.

I had my beta done yesterday 1 day before missed period (today was day of af) came back at 135. I have my next beta early tomorrow morning to make sure it doubled. Is 135 a good number before a missed period? I’m nervous for my appointment tomorrow since we have been trying for 4 yrs.