26 weeks and stressed

I’m 26 weeks but scan showed 25.

My dr informed today that the baby’s heart is functioning normally.

But she found a septum below the mitral valve, she said it could be a prominent papillary muscle or just a variation

and scheduled an appointment for me after 4 weeks to make sure everything is normal.

What I’m trying to say is the heart is pumping normally and the function is not affected, but it’s my first pregnancy and Idk if things usually clear up and becomes better after the baby gets bigger

She told me not to worry but I think that’s difficult for me.

I’m so stressed because in every appointment they tell me about something new and worrisome and I’m just mentally exhausted.

How do I make it without loosing my mind.