Only 4 dpo and feeling nauseous/tired??

My husband and I started trying to conceive about 5 months ago, after stopping my birth control. I’m just now getting good at detecting my PMS symptoms, because I never had any symptoms while on birth control (which I started at a young age). I know that 4 dpo seems too early to be getting pregnancy symptoms, but I just don’t feel myself today. Just this morning, I started feeling nauseous, a little fatigue, and some dizziness. I also had some off and on cramping, with diarrhea. I didn’t eat anything out of the ordinary. I didn’t take an ovulation test or anything, so Is it possible that I ovulated early this time, and these are pregnancy symptoms? If so, how long should I wait before testing??