I might be pregnant??? 🤞🏼

Hi! This is my first post on here. I was supposed to get my period today but haven’t. Not only that, but the past week or so, I’ve been feeling super nauseous, mostly in the morning but sometimes after eating. I’m constipated & having uterus twinges, not exactly the same as before I get my period. I also have been getting bad heartburn and headaches. I also have a faint brown line from my bellybutton to my pubic bone. My husband & I are hoping to be pregnant!