I Dont Know If My Ex Is Lying To Me

I dont know if my ex is lying to me again about being pregnant. She has twice lied to me before. The relationship is now over but now she is sending me a print out of a health summary from a ER visit saying she is pregnant.
The summary reads like this ...

Urine test / positive sensitive <= 20 mui / negative

She circled the positive sensitive <=20mui/ml and says that means she's pregnant

From my knowledge that is just the type of test, and being that it says in the box right next to it Negative, I'm convinced she is lying again,

Can you help me understand this print out it , thank you