brown discharge

i got a liitle brown discharge this this morning. do i have to worry? it was my 6weeks of pregnancy. in my 5weeks 3days i had trans v.the result is with sac and yoke but no embryo yet. now i have a brown discharge.so worried here.need an advise pls thnx.i m still for the sched of my 2nd trans v which will be on feb 18.hope everthing will be fine.