More than 1 set of multiples?

Anyone have more than 1 set of multiples? We have 3 kids; 1 set of twins and would like to try for 1 more. We are a little nervous to get twins again. We know the chances are higher after you have twins. We did need clomid to get pregnant and for twins the first round. We want to try without meds to see if we can get pregnant. Our twins are 2 and our oldest is 4.