Woah kinda weird..

So this app says I'm only 5 dpo and another app I have says I'm 8dpo. I have 3 kids, and am not currently trying, but I FEEL like I'm pregnant. I know this is the TTC group, but I figured I'd get the best opinions here. I've gotten positives early with each pregnancy, so I'm assuming I'm an early ovulator. The main period symptoms I get are just cramping a day or 2 before my period and stuff DURING my period. But yesterday and today I'm randomly nauseous, super duper dizzy, and have very sensitive nipples. Could I be crazy or do y'all think I should take a test soon?