preventing sunburn while pregnant

Hi ladies 
So I learned this week that I'm pregnant again! With summer right around the corner I'm concerned about sunburn. I have very pale skin and deal with a bad sunburn every year. I want to do the best I can to prevent this year because it's not just me that'll get the affects! 
Throw some prevention ideas at me because I am very excited to go swimming but don't want to worry so much that I don't enjoy myself/don't go at all!