BBQ 107 degrees? Need help deciding.

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I'm a little torn. I was invited to a friends house a couple weeks ago to BBQ late this afternoon. It's supposed to be 97 today but feel like 107. I told her I'm not sure that I want to be outside at all this weekend, being that I'm 36.5 weeks pregnant. She offered to have everyone stay inside and turn the mister on while outside. The BBQ consists of myself, my husband, friend, her husband and a couple that they are friends with. I really don't want to go over there to sit inside her house and make them sit inside with me. Plus, I'm going to be drinking tons of water to compensate for any time i do spend outside, so I'll be peeing every 30 seconds too. I really don't think I want to go. I know she's being really accommodating. So, my question is, should I just bite the bullet and go?