is this normal?

Angel

I’m almost 28 weeks and I’ve noticed recently that it’s difficult for me stand up/walk around for longer periods of time without feeling nauseous or exhausted like I need to sit down. I couldn’t even stand up long enough to take a shower, I had to sit in the bottom of the tub to finish washing my hair. I went grocery shopping the other day and wasn’t even in there 30 minutes before I felt like I needed to sit down. Is their anything I can do to help this? I have an event coming up that requires being on my feet for awhile, I made a commitment and really don’t want

to cancel on everybody.