Maternity Clothes on a Budget

I start my senior year next week and have pretty much nothing I can wear. All of my jeans are too tight, but I'm still in my first trimester so maternity jeans don't fit right and I can't just go up a size in jeans because my legs are still the same size so then they just fit baggy everywhere else. We don't have a bunch of money to blow on clothes that won't fit in a couple of weeks and I'm lost on what else I can wear other than maxi skirts and sweatpants. Suggestions???