one too many?

So ive been a little torn with an issue lately. I had my beautiful daughter in January and the birth experience (although tiring and painful) was just amazing for me, not only that but I loved the journey of being pregnant.  With that being said my husband brought two boys from previous relationships into our family so all together we have 3 kids already!! I guess thinking down the logical financial road three kids is more than enough, but it kind of upsets me that I have to think of these things instead of being able to have another one if I wanted to.  I guess it's my "fault"  for not thinking about this before getting married but you can't help who you fall for.  I guess I'm just wanting to vent bc I feel like I robbed myself of having that experience again...anyone else gone/going through this?