2 faint lines, 2 days in a row..

Torri • Hi! I`m Torri! I have 2 beautiful girls. 3 yrs old and 7 months old. Planning on one more in the next 2 years.
Do I call the doctor, wait until Friday when AF is due, or assume I'm pregnant?
I'm scared of a chemical pregnancy. I had never heard of them until recently. I'm stressing way too much and it's so not good if I really am pregnant. Help me ease my mind ladies. What would yall do? 
12 DPO