Light spotting 37 weeks 4 days

Just thought I would ask here before annoying my midwife on a Saturday afternoon. This is the first time I spotted this whole pregnancy. I worked out this AM strength training and walking 2 miles. No cramps. He was moving well before and I can still feel him moving now. He dropped at around 34 weeks and i have been feeling him hit my cervix quite a bit this week. The spotting is 2 spots less than the size of a dime on my panty liner. Nothing additional. No mucus. Any second or third time moms get spotting this late in pregnancy from exercising? Or should i be expecting my mucus plug coming pretty soon? I keep thinking he is gonna come before his due date because of how active I am.