<human>: The account I'm posting this from is a throwaway for privacy.

A little background:

My car had some issues, so I'm driving my stepdad's car while mine is getting fixed. I looked in the glove compartment, looking for some CDs when I found a box of (3) condoms. Thing is, the box was open and one was already taken out. So, I just recently asked my mom if she had her IUD (a contraceptive) replaced recently, she said yes, and it was earlier this year. And although the condoms could've been for extra protection, it seems extremely unlikely. Another thing to add: my mom has made some half-joking remarks about how he's probably sleeping with his 'side girlfriend', as he's out for quite a few hours on the weekends. 

The reason I haven't asked my mom is because she is under a lot of stress, and I don't want to put another burden on her shoulder. There's financial hardship, not due to a lack of money, but due to a poor management of it because of my stepfather; my stepfather, in next few days, will be gone for a couple months for business, and my mom will be taking care of my baby sister, brother, and I, while he's gone; and she has started a new job. 

I've known about the condoms for a couple weeks now, and I've been juggling how to approach the situation. I don't want to get anyone in trouble, but I feel like if there is some wrongdoing, that my mom should know. Should I wait until she's in a better spot, do it now, or say nothing at all unless there is irrefutable evidence?

Can you condense the text into three sentences or less?
<bot>: Found condoms in stepdad's car, possible cheating on his end, mom is stressed, unsure if should say anything or not.