signs of pregnancy again.?!

Sometimes stuff happens and whoops we find out we're in big trouble again. Missed my period but haven't taken a test yet. Scared too. Just had my baby girl 6 months ago and well there might be signs again. Being 6month postpartum your body doesn't go back so I've been feeling more sleepy than normal, my nipples got dark again after they had lightened, here and there I feel nauseous... before I take a test can that be signs of pregnancy?