Hi Kris .....
Welcome to the Forum. Yes, you have had a rough couple of years and I don't blame you one bit for being sad, scared, and angry. Take a deep breath and let us become your AN family with loads of reassurance and support available!
First of all, my own AN was not diagnosed until long after my three pregnancies, but I am a mom and can share in your motherly feelings right now.
Keep in mind that ANs normally grow very slowly, although you need to remain watchful for that occasional rare rapidly growing one. Thus, you should be able to complete your pregnancy without a huge growth in your AN.
Mayo Clinic is outstanding as a medical facility so you will be in good hands there.
There have been several pregnant gals on here with ANs ..... Cynthia (designergal) is expecting in July. (I private messaged her to look for you here.)
In the meantime, if you have not done so already, be sure to send for the ANA materials. They have loads of information and much reassurance.
As for after surgery, many of the members of this forum have had babies after AN removal and I know they will chime in here with their experiences. You may do things a little differently depending upon your recovery, but you will definitely be able to take care of your little guy like a normal mom. It is good that you have a husband, family, and friends for support because you will need more assistance than just recovering from a C-section.
Best thoughts and many prayers.
Clarice