sex and early pregnancy

TMI!!!  So I'm 7 weeks yesterday and my husband and I had sex for the first time since finding out we were expecting 4 weeks ago. Afterwards I went to the bathroom as usual and when I wiped there was pinkish discharge so I got paranoid. Went back again 5-10 minutes later and it was brown and a little bit more of it. Haven't had any since last night and I'm not hurting or anything. My first ultrasound is scheduled for tomorrow. Should I be worried or ????