If your gyn is not recommending a hysterectomy, it's probably fine to go ahead with a tummy tuck. If you were to need an abdominal hysterectomy in the future, the tummy tuck incisiion could likely be used by the gyn surgeon.
If you have heavy bleeding with your periods, make sure you mention this to your surgeon and make sure you take iron to keep your blood level healthy. There usually isn't much blood loss with tummy tuck but it's best to go into surgery with a "full tank".
Web reference: http://www.sowdermd.com