Pings, Pangs and contractions???

So yesterday was a wierd day for me. I think I experienced my first contractions of this pregnancy. I realize they are BH, but I thought it was too early to feel them. They started last evening with a very achy back. Then I would get menstrual like cramps and my abdomen would become very hard. My back ache would increase in intensity and then taper off. I did my best to convince myself they were nothing but today those demons have creeped in. What if something happened to the baby? What if my body is trying to expel it? I go to the doc Friday for my 14 week check-up, but until then I guess I get to worry. It may have been stress related because the day before my DS managed to splatter hot candle wax all over his face and arm (luckily he wasn't burned). But unfortunately I live in a world of what ifs and worse case scenario. It seems like I play all of the horrible things over and over in my head even when they turned out fine.
So now the countdown continues to Friday while I obsess over every twinge and pain. I'm taking it easy tonight. I had a physically stressful day today at work and I'm having some sharp pulling in my abdomen. Fingers crossed!!