Question for 2nd and 3rd timers!

Hey ladies! Ftm here. Wondering when you noticed travel (driving) became uncomfy during pregnancy? Month 7, 8? My boss wants me to go to a meeting when Im 7 months that is an hr away and the meeting is only an hr. So 2 hours of driving for a silly hour meeting. Ive asked if I can conference call in as I expect I will be uncomfy at that point. Ive already gained nearly 20lbs. Feeling pretty good so far but why drive far if it isnt necessary right? (Also it is Winter in Canada)