Vvfl or just late period


Never had a late period maybe 1 or 2 days late but not more then 6 days i feel really lightheaded and headaches and soreness in my breast and i have cramping on my left side i have a 7 months old and i had sex one day before my period was suppose to come but now iam 6 days late and thats never been and iuess with me til now so idk maybe iam too ealry