Brown discharge

I am about 6 weeks pregnant and started noticing brown discharge late Sunday night after the hubby and I had a bit of intense sex. I figured we had irritated my cervix, and the discharge dissapeared yesterday 5/12...well it is back this morning and a little more than it was previously. We haven't had sex since Sunday afternoon, but I did do a 30 minute workout on the elliptical yesterday evening. Anyone else have brown discharge for more than a few days in early pregnancy and everything turn out fine? A bit worried here since I am 35 this time, and the spotting I had with my daughter was further along (9 weeks). Also, my first OB appointment isn't scheduled until June 9th when I should be over 8 weeks.