I think it is time to change your name - not falling for it!!
When i got pregnant I used many different tests because I didn't believe it - and I was having fun, including two crystal clear tests. I didn't take photos sorry, but they had see through blue lines. I have never seen a test with black lines before, nor have i seen a doctor write "pregnancy positive" on a script before. They write a letter confirming your estimated due date that you can use for referrals to obs/midwives etc.
I also have a friend who went through exactly the same situation as you, and also my DHs ex tried that one when she found out we started going out. I don't know what is going through these girls heads, but the best advice is to actually cut off all contact, get on with your life and don't get drawn in to anything she tries - including text messages. She is not pregnant now, so if she does go and get pregnant it is her own stupid fault. If she still won't leave you alone - go for the restraining order - but do not have any contact with her yourself.
Good luck!

