First of all, Kudos to you for still Breastfeeding!!! (I am a serious breastfeeding advocate)

Second, I use the Depo Provera shot. i like that i don't have to go in the hut but for some women, not having a monthly is bothersome to them.

I have done a little research on birth control and breastfeeding and moms that exclusively B-feed are naturally infertile until baby starts eating other things. (It is called the LAM method) Otherwise, it is adviseable that barrier methods come next (which you and Mr. IWM have already done) so the next BC method is a Progesterone/Progestin-hormone method. these include the progestin-only pill (POP) also called the "mini-pill" (Micronor, Errin, Nor-QD, Ovrette, Microval, etc), the birth control injection (Depo Provera), the progesterone-releasing IUD (Mirena, Progestasert), the birth control implant (Norplant, Implanon).

the estrogen containing methods slow or decrease milk production.

the Progesterone BC methods also are helpful with endometriosis, in that it helps to decrease the endometrial lining.

more than likely your doc put you on a progesterone pill, but i would check just to be sure

Good Luck Gorgeous Momma!