What now???

I'm 9dpo and got a faint line this morning. When should I get all excited and download <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy apps</a> and when to make an appointment to confirm? 
I had a chemical last month at 3W4D. 
I'm scared. Should I be freezing? Like shouldn't my body temperature be higher? ( I'm usually freezing when af is near).