Baby aspirin, or low dose aspirin in a dosage of 81mg per tablet, is very beneficial to fertility. There are many other benefits to taking aspirin - such as benefiting the cardiovascular system (because of it's anticoagulative or nonclotting properties), pain reliever (analgesic) and fever reducer. People with heart problems take an aspirin daily, as a precaution to ward off potential heart attacks. If you are allergic to aspirin, have gastrointestinal problems or have problems with your blood clotting, I would suggest not taking it. In fact, anyone interested in beginning aspirin therapy should first seek the advice of their care provider.
You should consider the benefits of aspirin, especially if you have suffered from a miscarriage. But even if you haven't, taking the aspirin can still be beneficial in helping to prevent some future miscarriages. Some miscarriages are caused by a poorly lined uterus. Some are caused from the presence of antiphospholipid antibodies. These are proteins which appear to be related to coagulation problems -which can cause recurrent fetal loss. This happens when there is a disruption in the placental blood flow, due to clotting. The aspirin reduces the risk of clotting.
As for helping with the utering lining, it is believed that aspirin helps with the blood flow to the ovaries and uterus. Though this has not been fully researched, taking an aspirin a day certainly cannot hurt. Because of the benefits listed above to the cardiovascular system, it stands to reason that if it also helps with fertility, why not give it a try?