I've been having cravings, I'm super exhausted, and I get nauseous. I really hope I'm not pregnant…

I've been having cravings, I'm super exhausted, and I get nauseous. I really hope I'm not pregnant again.. not yet.. I started having my period after I gave birth every 3 weeks it would come for 5 days but I haven't had it the past 6 weeks which I know my body is still trying to adjust since I has my daughter 3 months ago but with the other things I mentioned at the begining of my post I'm worried. Should I take a test or just wait it out a little longer..?