Sauna during tww

I am 10dpo, and have gotten bfps the last few days. I said that I would go to a sauna tomorrow. This was planned awhile ago. Is it safe? I don't know how I am going to get out of it! I originally thought we were just getting massages! I guess I could just say I feel too dizzy after a few minutes in the hot tub or sauna. 

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