period

Ok so I am 5 months pp and I love my son! I had a period in December and then like clock work one in January. After my period ended I started to get a bald spot in the front of my hair. And now I am two weeks late for February's period. I'm scared because I don't want to be pregnant again. I don't feel pregnant because when I was pregnant with my son I was exhausted and I couldn't eat anything. I haven't taken a pregnancy test yet because I keep hoping I will start, but it's starting to worry me. Any other mommies have this happen?? Any advice would be greatly appreciated. Me and my husband have been having sex but always with condoms. Never without one and we haven't noticed one breaking