Also, you can test at two weeks after possible conception. My fertility/endo doctor taught me this, both times I tested positive I was only two weeks out from IUI.

No sense being anxious longer than necessary, you're putting yourself through stress with waiting and wondering as well. I hated the negative tests so much, but I also hated wondering and waiting. It is a tough call, I feel for you.
I do have to say that your symptoms match mine the two times I was pregnant. Very very tired both times, and all the things you listed.

It is different. It's painful and I don't get moody or nauseous pre period. It hurts to walk or move.

I would say talk to your doctor. Is this different from your pre-period symptoms? I know periods are different for everyone. It also may be too early to take a pregnancy test. I know all of this is not exactly helpful. :/. Still I wish you the best.