could i get away with having two pieces of wholemeal toast now

i'm watching my diet because i manage diabetes type 2 and are trying to lose some weight too, as ive gained a stone in weight, i go swimming at the gym a few times a week and swim for only 1 hour...today i had my breakfast, lunch and main meal....but i'm still feeling a little hungry and was wondering if i could get away with have two pieces of wholemeal toast? its 10:15pm at the moment here..