How to calculate pregnancy weeks to months can be so CONFUSING! Know why? Well, there are TWO common methods! Bookmark this super handy pregnancy weeks to months chart to always know exactly which baby week, month, and trimesters of pregnancy you are in. AND your due date! (Also for new moms interested in: first pregnancy, pregnancy tips, pregnancy facts, pregnancy week by week, pregnancy stages, early pregnancy, pregnancy months, getting pregnant, pregnancy guide, pregnancy timeline.)