Abnormal discharge?

Al
I am freeking out!!
I had a miscarriage last december at 8 week (we only saw the sac)  and now I'm pregnant again (no period in between). I'm freeking out over everything this time and i'm only 4w4d. My heart just couln't handle another miscarriage :(  I've been experiencing a little yellow/greenish discharge only when I wipe. It's not irritating and does not smell, has anyone had this before and everything was fine? Should I see my doctor?