Pregnancy Randomizer

I tried for a while to find a useful randomizer for pregnancy chances, preferably with changable values. I didn't find anything useful. 

So I decided to make one for myself with the Libre Calculator and I am content with this one. I tried to orientate myself on actually realistic numbers but also tweaked them a bit to not overcomplicate things and still have useful numbers.

In case that someone actually needs something like that, here you are.

If you use it for your work or for commercial purposes, you can do so, but please mention me as the source.

Suggestions and comments are welcome.