Has this happened to anyone else?

I took a home pregnancy test at about 3p.m. today and it came out negative. I do have sore , headaches every single frickin' day, backaches every so often, very very very tired, and sore stomach muscles on the bottom left side. I had unprotected on august 25 & september 5 and both times my boyfriend d into me. I definitely think I am pregnant but was it too early to take a test? Has anyone else's came out neg. although they were? When should I go get bloodwork? And anyone with similar experiences please tell! Thanks! arianarose17@yahoo.com (: