Advice please

Laura • Hey I`m laura 19 recently had my baby boy :) been with my fiancé a short time and love him millions !
Hi ladies I'm 25+2 my little man is due September 4th I've been diagnosed with pelvic girdle pain and on bed rest for two weeks due to unexplainable cramp pain in my low abdomen. However for the past few weeks I keep experiencing really bad pain in my ribs and slightly in my chest . What could this be ?