Cramping on left side and spotting early pregnancy?

Sarah • Been with hubby 7 years & married 3. Luna Violet 💗 horn Oct 2015 (conceived with glow help!) & River Elijah 💙 born Aug 19 2017! Both natural !! 🎉
Hey everyone, I'm a day shy of 6 weeks and for the past three days I've had semi severe cramps on my left side of my stomach. I've also had very mild brown spotting for the past three days also. Unfortunately my doctor said it's to early to tell what's going on and I have an ultrasound scheduled in a week and a half. I'm wondering if anyone had any of these pains or problems and if they ended happily or not? Of course I'm worried. I have always had cramps on and off since finding out were pregnant around 4 weeks, but the spotting and left side thing is fairly new and causing concern. I so hope everything is okay but it really sucks not knowing. Any and all advice is welcome! Thanks in advance.