Tired

I have been feeling tired. Just want to sleep and eat. When I hold my baby I can't wait to put him in his bed. My period is late by four days. I last had a period in August of 2016. I bleed for a whole week because, I wasn't breastfeeding my baby so it came when turned a month old. I had unprotected sex twice during my ovulation week. And a day before my period is due. What should I do?