6 weeks pregnant

I’m 6 weeks. I still have no symptoms at all. Really nervous because with my first I had every symptom in the book. And I know you don’t always experience the same symptoms each time. I feel tired of course & it’s already uncomfortable to lay on my belly. I’ve always been a belly sleeper and with my first I could sleep on my belly till I was 20+ weeks. With this one I can’t. It literally feel like too much pressure on my belly. & I’m worried because today I had VERY FAINT pink color on when I went to wipe. Any ideas? Am I still okay? I get an Ultrasound this week to check everything & see exactly how far I am. The 6 weeks is off my last cycle. I did have periods with my last child so that’s why they’re wanting to do an ultrasound early.