certain concerns/questions

I am new at this and me and my fiance have just decided that in the fall we will start trying to get pregnant. I have been on the pill about 7 years or so. I am so terrified of having a miscariage that I want to be off the pill for like a good 3-4 months to allow certian chemicals from the pill to run out of my body's system. I have been wanting children for some time now and more now that my friends are having children also. I am just wondering if the pill has a relation or contributes (sometimes) to miscarriages? This baby (that we are planning for) is very important and special to me. I want to do anything possible to be as healthy and ready to start conceiving. If you have any suggestions or ideas that would be greatly appreciated.