Thank you for your reply! I'm super worried and I hope it's not dying! Indeed, it had pinkish flowers.
I received it as a gift 10 days ago. It's sitting in the pot it came in from the store. I got it last Friday and I left it at work because I had received other flowers too and I couldnt carry them all at once. It sat for two days close to the window, nobody watered it during those two days. When I came back on Monday morning I saw that it looked a bit tired so I watered it. Then I took it home and watered it a bit more some days later. But the plant is getting worse. Many leaves have fallen off and I'm most worried about the brown stems close to the root. I really hope it's not a fungal infection or rotting caused by me overwatering.
I must look really dumb, and I apologize, I just don't know anything about how to care for plants.