gained weight?

Rachael
Hey everyone, so I moved out about 8 months ago from my parents and in with my boyfriend. We have been really tight on money because of rent being so high and I'm the only one working because the boyfriend is in college. I was at the gym the other day (I go about once a week) and I weighed myself and I have gained 30 pounds!!!!!!! How is this possible? We are tight in money but I always try to cook homemade meals as much as I can and we try to buy fruit and veg as often as possible. I don't understand 😫