Just download any good pregnancy tracker app like BabyCenter, it makes it so easy. You just enter your LMP and it tells you exact weeks and months. Super handy!
It can get so confusing and stressful to calculate months vs weeks, I used to panic thinking I got the dates wrong. Just breathe, your gynac will tell you the exact week based on scan. Take it easy.
I am actually trying to conceive now and even I get so confused about this calculation. Do we start counting from the day we miss our period or before that? It's so tricky!
Honestly, I don't even count weeks anymore, I just count by what craving I have this month! Right now it's hot samosas. But jokes apart, doctor calculates it from your last period date.
Calculating months is a bit complicated because medical weeks don't align perfectly with calendar months. Since I had thyroid issues, we had to be very precise with dating scans and blood tests. Do keep a regular check with your doc.
God has his own beautiful way of counting, dear. Just focus on your health, stay positive, and do your daily prayers. The doctor's scan will tell you the exact progress anyway.