Hmmm, mine is no darker than custard yellow, usually more like cream (I'm 35 weeks). You could always ring the midwife/maternity hub and ask over the phone if you're unsure. I'd ask them rather than a GP as they're more specialised.
Oh and no need to pump and store, it will keep coming until your milk comes in a few days post birth. In fact I think I read whilst I was pregnant that the nipple stimulation from pumping isn't the best idea towards the end of pregnancy as it triggers hormones to stimulate the uterus! You could collect it in syringes though, to use if baby doesn't latch immediately, this is how I initially fed my DD in hospital.