Talking myself into it

I woke up with such a horrendous backache I was positive it was the first signs of labor. However, now I realize that when you run a verticut machine over 3 lots, rake the yard a few times and throw grass seed on everything in sight it's likely to cause a backache, especially when your body has an extra 30 pounds strapped to the front of it. I've been searching for signs of labor so meticulously that all I'm doing is making myself more and more paranoid that it will never happen. Other than very explainable backaches there have been no other symptoms. I'm starting to get very discouraged.