An ovulation is unmistakable, your BP will look like she swallowed a football, not a small lump and not located in the last portion of her body but in the mid section
Its not like the very end of her... more like a 6ish inches from the tip of her tail, up to about a foot or more long. I haven't taken her out so I haven't been able to get a very good look at her. I will take a picture when I can.