TTC Questions, Please help :)

Ashley
Hi everyone!
SO and I are TTC and I have a couple questions for who ever is willing to answer :)
My fertile window is this coming week - August 30 to September 5. 
Is it best to try every day or evey other day during that time? I have heard both. 
Is there anything else I should do/not do during the fertile window that will increase my chances of conceiving? 
Also, I was taking a prenatal vitamin but they made me have awful stomach cramps. I read online that the amount of iron in them, 28 mcg, could have been too much for my stomach to handle. Now I'm taking folic acid pills. Any suggestions on multi vitamins that I can take?
SO and I are so ready and I have a good feeling about next week :)
Thank you for your help