Super Early Signs??

Total newbe at this and need some help from you experienced mamas. 28yo and after 4.5 years of my hubby and I doing everything possible NOT to conceive, we are finally ready! Only 5 DPO but I have been experiencing serious dizziness, fatigue, and some gas for 3 days now. I've always been super in tune with my body but this is too new to me! Has anyone else experienced this or Is this all in my head??