Pregnant and confused!

So I found out I was pregnant with baby #2 . Around 4 weeks of course I was nauseous like I literally couldn’t eat anything without throwing it up including water. Around maybe 6 weeks I started spotting off and on for like a week. It went from brown to pink back to brown and pink etc etc. (I had bad back pain, shoulder pain and tiny bit of cramping) One day I went into the bathroom and notice bright red blood! It had a tiny tiny blood clot. It was maybe a size of a pinky nail. I wipe it was red but it completely went away after 5 minutes and I started spotting brown again. I’m currently 9 weeks and haven’t spotted since then. I haven’t had my first ultrasound yet and I’m just scared. Have anyone experienced this before? (I never had this with my first pregnancy)