Pregnancy is a beautiful thing and should not stop you from enjoying the sun. Some moms-to-be choose bikinis so they don’t have to worry about the middle part fitting, but as time passes, a one piece might be something you will consider.
There are stretchy one pieces for moms-to-be that you can wear all summer with any trouble. There are also those that can be let out or are adjustable as you expand. Extra support for the bust might be another thought at your time passes.
You might want to take your measurements before you leave the house so if you go for two pieces, you will be better able to pick off the rack and not spend all day finding the one that is the right size. If your pregnancy will go through the whole summer then spend the extra bucks for a well made suit since it will probably be the only one you will wear the whole season. That way you won’t worry about the stretch of the suit. Your suit should allow you to do all those fun summer things and not to just sit on the sand and watch the other have fun.