Help?!

Hi! A little over 1 year PP. I’ve been getting my period for the last 6 months. Usually comes right on time or 2-3 days early. Currently day three of predicted cycle but my period has not started. Test this am was negative. I’ve been having some cramping for last 5 days, lower back ache, nausea, constipation (not normal for me) and overall my body just feels whooped. Not sure if it is just too early to test or if dr appt needed? Any recommendations or related situations?