When do you put on the most weight during pregnancy?

Suhaifa • Pregnant with Baby #2 | Attempting VBAC
My starting weight was 95kg and I managed to lose some weight due to morning sickness. I am now 15weeks pregnant and weight 93.5. 
I was just wondering when does one put on the most weight or is it gradual as the weeks go by?
I would hate reach 40weeks and weigh more than 105kg.