Could i be pregnant?

Sarah
Not TTC but it wouldn't be a bad thing. I am now 19 dpo and AF is late about 5 days. I've been feeling so tired, having cramps and backache for the past 4 days. I have now taken 3 tests all negative in the past 3 days. Is it possible that I am pregnant? So frustrated. Just want to know either way. I'm not a patient person Lol.