Yellowish discharge boleh jadi normal especially kalau tak ada bau busuk or itching, tapi at 7 weeks pregnant memang better safe than sorry, go see your doctor just to confirm everything's good, ya? Pregnancy hormones memang boleh change discharge color and consistency, tapi since you're anxious about it (and first time mom energy is real!), let the doctor put your mind at ease, tak payah worry sendiri.