Yes, I'm 38" across bust but sometimes I'll measure at 37.5, 37 and sometimes at 36.7. This is normal to me, my breast go through different changes during the day, bras, hormones et cetera. But usually in the evening [after I take off my bra to relax] give my breasts some time to bounce back they measure at 38" again. Also make sure your back is straight, when I don't straighten my back I measure at 36" or 35", so make sure your back is straight when you measure to get your correct measurements, might be a few inches more then you think. 