For everybody on here that asks "How many months am I , I'm 16w4d (ect.)"
Here is your answer.
First Trimester -
Month 1 ; Weeks 1,2,3,4
Month 2 ; Week 5,6,7,8
Month 3 ; Weeks 9,10,11,12,13
Second Trimester -
Month 4 ; Weeks 14,15,16,17
Month 5 ; Weeks 18,19,20,21
Month 6 ; Weeks 22,23,24,25,26
Third Trimester -
Month 7 ; Weeks 27,28,29,30
Month 8 ; Weeks 31,32,33,34,35
Month 9 ; Weeks 36,37,38,39,40