I know it's hard to face a possibly negative test, but spotting for that long doesn't sound normal for you. I think it warrants a conversation/visit to your gyn, and they will likely ask for a blood test. I know it sucks, but it's better to get things checked out/answers for your health.
Are you actively trying? Do you do any charting/ how was your bd last cycle?
But personally, I would be on the phone first thing to try and get an appointment in before the weekend. Because pregnant or not, you need to get to the bottom of it. If you are pregnant, you will need to be assessed. If you aren't, you may be risking your reproductive health and/or you can't bd if you are spotting so you might miss out on trying this cycle. I'm being worst case scenarios here but I reallly want you to get in to see your gyno. FXed!