I'm 18 dpo and still haven't gotten af?

Jennifer • My husband and i have married for nine year. Together we have had 4 miscarriages. We have been ttc for 1 year now.
I'm 18 dpo and still haven't gotten af. Today i had light pink when i wiped. I took a test the day before af was due which is never late and it was negative. Could i be pregnant?