Question About Early Twin Symptoms?

Is Theyre Anything That Made You Think You Were Having More Than One Baby?? I Just Had A Baby Girl Nov. 6th Shes 5 Months..And Just Found Out Im Pregnant 4 Weeks 1Day...And My Boobs Are Leaking ?? Is Something Wrong ? Or Is This Normal.? Did The Moms That Have Twins Experience This?? Because Twins Run In My Family....Thank You...