tested to early??

Anne
I'm 10 DPO, did the BD on one high and one peak fertile day according to my OPK. My cycle is very regular, usually 28-29 days. AF is due this Friday. I took a pregnancy today because the waiting was killing me, so 5 days before my expected start day. I used a First Response early detection test. Test was negative. I'm super bummed but wondering if I still tested too early even though I was using an early detection test? Any personal experiences would be appreciated.
Thanks :)