newbie-- questions. please answer

C
How come some people get a positive 5 days before AF and others don't until after their expected AF date? Tomorrow I'm 3 days until AF is expected. 
I just wanna be pregnant. Did everything I was supposed to and now I just keep researching hoping that something's happening. When should I test again? 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors