Need advice

My 3 week old has to go to the hospital on Monday for a Pediactric cardiology appointment. We’ve been noticing she gets pale randomly and pediatrician said it’s not normal so they’re sending us for some testing. Anyways, my question is I had a c-section.. 3 weeks ago. I’m still in a ton of pain and feel like I’m having such a difficult recovery. How do I navigate this in bringing my baby to the hospital. In the car seat? Isn’t that heavy to carry? I haven’t tried yet but I guess j should. They said no one else can attend with me due to COVID. Ugh. Stressed and nervous. Thanks mamas