6 DPO?

Courtney • Married to the love of my life and trying to conceive our one baby to complete our small yet mighty happy family. ❤️
Is it possible to have symptoms of any sort at only 5/6 DPO? I haven't been feeling myself for about two days now. I'm having heartburn which I never get, I'm super tired and I constantly feel like I want to cry for no reason! Is it possible or is it just coincidence and psyching myself out? I'm still not due for AF for 10 days :(