For those of us who grew up with moms, and still have our moms around now that we're adults, the moment when we find ourselves staring down the barrel of motherhood is usually when we start asking for some motherly advice. I get it, sure, but there are times you shouldn't listen to your own mother when you're pregnant, too. Yes your mom probably gave birth to you, and even if she didn't she at least helped you become the extremely wonderful person you are (and possibly she did the same thing for your siblings who are, eh, vaguely close to being as awesome as you). She knows some things, to be sure, but she doesn't know all the things, guys.
If there's been one constant since the Beginning of Having Babies, it's been new baby-havers looking to veteran baby-havers for advice on how to have the babies. It's basically how we've kept humans around this long. So if you're someone who is lucky enough to have a mom, and lucky enough to be able to stand to have a conversation with your mom, chances are hight that your mom is going to be an active part of your pregnancy.
For the most part, having your mother be around to help you plan, prepare, and celebrate brings with it a mountain of upsides with very few downsides. That said, when the downsides of "your mom + your pregnancy" do show themselves, they can be catastrophic if not handled properly. What exactly constitutes "proper handling" is personal and unique to each family and honestly not something I'm qualified to counsel you on.
What I do know is that a lot of potential problems that could stem from your mom's involvement in your pregnancy can be solved by just *looks around to make sure my mom isn't nearby* ignoring her. IGNORE YOUR MOM. Ignore her presence, ignore her opinions, and don't hesitate to say no, specifically in the following instances, which are almost guaranteed to come up at some point in your pregnancy.