Pain in stomach

Currently 31 weeks, as of Wednesday baby was still in the breech position. Ever since tuesday afternoon I have had this painful cramp in my lower left side down to my pelvis, I mentioned it to my dr and he just said round ligament pain. But its still hurting 3 days later & every once in a while it flares up really bad and has me doubling over in pain. Is this something i should be worried about? I googled it and it keeps popping up as either preterm labor or baby is turning but I thought with both of those the pain would be all over and not centralized to one spot. Any advice would help ladies