Spotting / bleeding and 7 weeks

I'm about 7 weeks pregnant and have my first ultrasound on Wednesday morning. I conceived by <a href="">iui</a>. Today I started spotting. It's not enough to get on my liner but I see fresh blood when I wipe with a toilet paper and small traces in the toilet when I pee. Should I do worried? My nurse mentioned if I had any severe pain or bleeding that's more than a period then to go to er. This is not that much but it is fresh looking blood but I only see it on toilet paper. I'll call and inform my dr first thing in the morning but I'm starting to get worried. I have tried so hard to conceive and am really excited but now I'm getting worried. Is this normal