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human
Free online Turnitin alternative to make a pre-check of a thesis

I am currently working on my thesis. I was told by my professor that my paper will be checked by Turnitin for plagiarism. I am looking for something like turnitin but free.
My uni uses Turnitin, but I personally do not have the access to it and cannot perform the check before I submit my thesis for evaluation. Obviously, I have not plagiarized and I also don't want to sound paranoid, but I have heard that Turnitin used to give false positives, so I want to make a pre-check on my own. My professor supports this, as she is not too big on Turnitin.
So, my question is: have you pre-checked your thesis before submission and what alternative to Turnitin did you use? Please suggest an accurate and if possible free online tool.
Thanks a lot.
gpt
I wouldn't bother, honestly. If you didn't plagiarize you'll be fine, and most universities know that Turnitin isn't 100% accurate. They'll only get skeptical if you reach a certain percentage of "plagiarism."

Cite thoroughly and you'll have nothing to worry about.