About 5-6 weeks pregnant with spotting and cramping?

Just found out about a week ago that I was pregnant via a home pregnancy test. Been having mild cramping, nothing major, similar to the cramps I would get prior to the start of my cycle. Earlier today after using the bathroom there was a small amount of brownish blood on the tissue. I've read this to be normal so I laid down and rested for a bit. Now the blood is a bit more, still only noticeable on the tissue but it is more red in color, which concerns me. This will be my second child, but the last one was 9 years ago and I can't recall having any of this. Should I go ahead and get checked out or wait till next week when I see the OB/GYN for the first time?