Don't ask this question here. Not being mean you'll just get a lot of mixed answers it's frustrating because you don't know who to listen to. There are two methods of counting it.
1. Every 4 weeks
OR
2. The pregnancy weeks to months chart
1-4weeks=1month
5-8=2
9-13=3
14-17=4
18-21=5
22-26=6
27-31=7
32-35=8
36-40=9
I personally use the pregnancy chart which I bing imaged and saved a cute photo on my phone to keep track but a lot of women use the every 4 weeks although that would make every month 28 days that's not right. Either way you're pregnant for 40 weeks. But I use the chart so that would mean you're 5 months and not still in your 4th so doesn't that sound better. haah
U are 4.5 months at 20 weeks u will be officially 5 Months.
You've just completed 4 full months and you're in the 1st week of your 5th month.
Lol my bad your close to 5 your 4 1/2