that hormone

Jori
Hello everyone. Let me start of saying that I am a mother of one 7 year old girl. When I was pregnant with her we weren't able to find out till I was three months. I took 6 test home test,3 pos 3 neg I had to get blood work to confirm.  
My cycle started feb 1. We had sex  the 13 of feb . I spotted light pink for 4 daysz (starting feb 18). My cycle is 3 days late: 
We know where pregnant, call it intuition. I wanted to know do others women have an issue with low HGG hormone or what every it's called?