Help a girl out...

Sadie
I am currently 19dpo and cycle day 33. I have super tender breasts and nipples, super moody, and 4 days late. We have been ttc for over 2.5 years and are ready. Af is usually very very predictable. I tested this afternoon and got a bfn. Am I still to early? What are some symptoms you have ever had when in the same situation as I am.