If you have endometriosis (scar tissue), it is possible that you have Polycystic Ovarian Syndrome (PCOS). many women with PCOS struggle with infertility.
i suggest going to an endocrinologist, or at least talking with your doctor about hormone tests / other test and PCOS (no need to have cystic ovaries to be diagnosed with PCOS.)
PCOS can also include insulin resistence (including type 2 diabetes) irregular menstrual cycles, low milk supply during lactation, hyperandrogenism (signs of too much testosterone, such as hirsuitism (hair in "masculine" places or quantitites), male pattern baldness or thinning hair, irregular menstrual cycles, midsection obesity (but not necessarily elsewhere on the body), skin tags, and a host of other signs and symptoms - only a couple of which are required for a PCOS diagnosis.
If any of this rings a bell, then definitely consult with your doctor.
treatment with metformin during pregnancy has been shown to decrease the risk of miscarriage significantly for women with PCOS, and could help with conception as well. If hyperandrogenism is an issue, than the hormone imbalances would most likely need to be addressed.
A naturopathic physician is another option, as there are many potent herbs for endocrine disorders.