Could it be pregnancy?

My baby is 4months & i stopped BF around the first month. That same month i got my period & continue to get it every month. All last month & still this month i haven’t gotten my period. But I’m also not having any symptoms of being pregnant either. I feel fine. & i also don’t have any symptoms of my period. I usually get EXTREMELY tired. Could this just be because i had my daughter 4m ago? Or should i take a test even tho I’ve had no symptoms of pregnancy?