Tmi question about discharge in early pregnancy

Jg • Pregnant with TWINS after mc in April 2015 -looking forward to this journey - trying my best not to be anxious
I am 5 weeks so still very early and have been having very light yellow discharge - mostly liquidy not creamy - I have worn a pad to monitor and not very much comes out -  but am starting to freak out a bit - I miscarried before and that started out as brown discharge not yellow - does anyone know what could be causing this and is this normal? Thanks for any help/advice