More Bobo to come if still alive, yes.
Dumdum will come back, more towards the last chapter of development. Pregnancies will happen more towards the ending roads as well For the beasty pregnancy, no, it won't happen.
Well, while bestiality pregnancy would be nice (I just like the corruption theme), I also understand it would take way too much effort and time to be plausible in the writing... but ever thought of phantom pregnancy? Some causes incluse sexual abuse, trauma and anxiety, which surpisingly all fit Myriam already...
Finally, phantom pregancy can also happen due to an intense desire to get pregnant... So depends on how it goes with Cassius, and IF you want to give him an ending route or not, that stuff actually isn't that bad storywise, and probably wouldn't take much of your time besides writing. And it also fits on the type of writing and story development you're applying to Myriam.
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, the symptoms also apply to your character development so far. And again, it is way more plausible than an actual beasty pregnancy. Not to mention it can also apply to human characters.