Whats going on?????

My husband and i have been ttc our 5th child. Together this will be our 3rd we both have a child from past realationships. i just got off depo last sept and i know it can take up to year to conceive i am 7dpo last week i felt like i was starving like 24/7 now this week my belly is so hard and i feel full 24/7 without eating anything i have never felt this before just wondering if anyone has felt this way before