Maybe?????

I am now 7 days late. My last period was June 26 and I was expected to start again July 29. My periods are a little crazy; sometimes they last 2 weeks (like they did in June) and sometimes I only have them for 4 to 7 days. It is estimated that my cycle length is 32 days. I don't know what to do. I have stopped drinking anything with caffine just incase and I have started taking vitamins. For the past week I have been waking up with what seems to be gas pains but I am never able to expell anything. I have also been nauseous as soon as I open my eyes but that eventually goes away (after 2 or so hours of being awake). What do you all think? Should I take a test now or wait a little longer? I am really scared because when I normally take a test I start soon after. I hope this isn't one of those cases again. It's funny because I am scared yet excited. Excited about the fact that I may indeed be pregnant (FINALLY) but scared that my heart may be broken again. Help me out... what should I do.. and for those of you that have had a child... are any of these symptoms of pregnany or symptoms of a late period?