unsure about what to do

Kylie
I'm looking for opinions on what I should do next, I had a very early miscarriage in august (unexpected pregnant) but that got us thinking that we are ready for another. So we started trying, it's not October. We have had no luck, my periods are crazy right now (I'm not sure why) I was suppose to start on 10/2 but didn't and haven't still. I've taken many hpt all negative. 
I'm trying to decide if I should go see my doctor and have tests done or just try to let things happen.. 
any suggestions?