7DPO with pregnancy symptoms

Hi all, I have sore breasts, fatigue, backache, minor dizziness and cramps and feel like I'm getting sick (sore throat and nausea).

I'm around 7DPO, so obviously it's too early to test. I never get PMS symptoms besides heavy cramping - the only times I've had breasts this sore are from working out (lol, not that) and being pregnant.

My period is due the 8th (PCOS means it's based off a guess) so when in the world should I test for accurate results? No way I can wait till the 8th, lol. Thanks in advance.