The hero we need - AITA for asking a pregnant woman to leave the train seat that I reserved?

I was booking a train for a trip and the App told me during the booking process that the train will be full and that I should consider reserving a seat. I went for it since its only 4.50 Euro and I really needed to get some work done during the trip.

The train was absolutely packed, but I quickly found my seat and saw that a pregnant woman sat in it. I showed her my reservation and politely asked her to leave, already earning some judging looks from the other passengers. She refused and went on a pretty long tirade, calling me disrespectful and a disgrace for men.

I didnt want to make a huge scene and felt really awkward so I offered her to buy the seat from me for 4.50 Euro. She refused again and called me a greedy son of a bitch.

At that point I got really pissed, waited for the conductor and informed him about the situation. He asked the lady to leave and I was able to sit. However, everybody was staring me into the ground.

I really dont know how to feel about this. I think I was in the right but obviously the other passengers didnt feel the same way. I havent talked about it with family or friends, afraid of their reaction.

So Reddit, am I the asshole here?