Kegel & pelvic tilts
In addition to doing kegel or pelvic floor exercises, you can wear a pregnancy
or maternity binder, available at most stores that sell maternity clothes.
There are a number of websites you can visit with explanations of the exercises and other tips. An example is http://www.Whattoexpect.Com/pregnancy/symptoms-and-solutions/symphysis-pubic-dysfunction.Aspx.