TTC unsuccessful

My husband and I have been trying to conceive for 5 months now. We both have an unplanned accidental child from past relationships. We want more children of course. We haven't had any luck or even come close. It's very frustrating and stressful. He has made the comment to me that it's probably my own doing that I haven't become pregnant because I'm always so stressed and I bottle everything up instead of talking with him like I should. Well this month I've been focused on relaxing more and being more open. Maybe it worked and maybe it hasn't yet. I have just over a week until AF is due now and by now I should've had my usual PMS symptoms; grumpy, emotional, extremely tender breasts, back pain, the whole nightmare. Well I don't. I've had cramping on the left side today and I've been gassy for a couple of days and that is it. I'm just not sure what to think of anything at this point. If I can get pregnant through BC then shouldnt planning a child be even easier?! I'm just so frustrated! I give props to the ladies that can do this for months or even years at a time and who can just keep on trying without giving up. True inspiration from all of you ladies out there!!!