Im engaged at the age of 17 to a wonderful young woman?

so im 17 and my fiancee is 15, her family knows were engaged, mine doesn't but they have the suspicions i am, my mom doesn't like the idea but is fine with it my family loves her just as her family loves me, my question is when we get married should we actually have a wedding or get married in court then have an after-party? whats Ur opinion on this, me and her just truly love each other.unlike most teens were getting married because we have found true love unlike most teens where they only get married because of a pregnancy BTW i saved her life she means alot to me and id die if i ever lost her. me and her are participating in sexual activities but we always use protection shes on the pill i wear a condom.