Spotting at almost 7 weeks

So I will be 7 weeks on Saturday and have been spotting the past couple of days. Mostly brown or light pink so I wasn't concerned as that is considered old blood. Tonight after sex I had a small amount  of red blood but then it turned brownish. No cramping or pain. Experiencing nausea for the first time today...allll day. I plan to call my doctor tomorrow. I haven't been to see her yet asmost wont  see you until 6-8+ weeks. Am I okay to wait until tomorrow to see her or should I go somewhere tonight?