More and more companies offer pregnant women as early as the 6th month of pregnancy. It depends on the collective agreement of the company. The expectant mother can sometimes start an hour later and finish an hour earlier each day, or work at 4/5 (paid as full time) during the last trimester of her pregnancy. Ask your human resources department what you are entitled to.
In addition, know that you can go to all your medical appointments related to your pregnancy (and your delivery) on your working time, without loss of salary.
In France, according to INSEE, 80% of mothers who have a child and 70% of those who have two work, this is why more and more companies seem to improve their flexibility to help these women to better reconcile family and professional life.