I think I am out what do you think

Shatara
Today I am cd27 12dpo and u have some terrible pains so I went to an urgent care and they did a urine test...bfn but they still wanted to find out what was wrong so they sent me to get an ultrasound and they didn't see anything in there ... is it to small to see right now my AF is suppose to be here on wed what do you think ladies