Can I use the hot tub?

Hi guys, I have been reading conflicting advice about using a hot tub whilst pregnant and was wondering if anybody could help. My in laws have a tub in garden which we tend to use quite a lot over the summer and I've read that if you turn it down to body temp and only stay in for 10-15 mins it'll be ok, anybody know if this is correct? I'm 16 weeks now but by the time we get round to using it I'll be nearing the end of the second trimester anyway. please help, it's something I'm really going to miss if I can't!