Should I talk to my friend about profits in our business?

My friend and I started a T-Shirt business about 3-4 years ago. He and his partner have invested all the money into the company. All I've done is design the graphics. The mistake I made is I did not sign a contract stating who gets what percent of the profit. They recently opened a store in a very popular mall and according to them made over 200k in profits last year. I feel I need to speak to him about who gets what percentage of profits. Legally I feel I'm not entitled to any profits since everything is in their name and they payed for everything. If that's the case, I at least want to be composted for my time and designs. Since they are making money of my creative work. Going through A LOT right now, and money for just my time and designs is life changing money for me.