The Possibility..

I just want to know if is it possible to get pregnant if may contact right after the period? And as early as 1 week may mga symptoms ba like parang masikip ang puson, well.. I feel this lil bit of pain sa balakang and mostly sa gabie yung feeling na feverish but di naman ako nilalagnat tlaga, then my breast yung same sa going ka mag mens.. Idk parang ang aga naman o dahil lang to sa galing pa ako nag mens? Parang ang early naman yata diba but is it possible?