I'm pretty sure she's pregnant, rounder than normal, gravid spot (not real dark but noticeable) but for about 2 weeks she is staying mainly on the bottom - resting? When I feed & she realizes what's going on she comes up & eats well & looks fine, even chasing the others away from the food but I'm concerned about the sitting on the bottom. I've been giving some fresh water every day or every other day & I've added some salt. If she's just waiting to drop, is this normal to act like this for two weeks? My platys may hide for a day or so before dropping but not this long. Any ideas?