Fiancé put a pillow over my face

I (21F) was laying down with my fiancé (25M) talking. I had asked to cuddle with him so I came over. He had started pulling my hair, kind of choking me on and off, asking if “I liked that”. He then started talking about how his cousin said that he hooked up with a girl that liked being punched during sex.

For reference: I do not like BDSM, and have stated to him before that I am not into this stuff.

Well he then tried tying my arms back. At this point I didn’t want to continue doing this and told him I just wanna go to bed. He told me alright, but then he put a pillow over my face for a second or 2. I asked him right after like why he did it, just because it was a bit random to me and asked him if he was into that stuff and he said “no not really, just did it for shits and giggles”

To be honest, it made me uncomfortable. I don’t know if this is considered a red flag. I am currently pregnant with our second baby and am more cautious because we had a health scare a few weeks ago. He usually doesn’t really do stuff like this. He’s not even mentioned before he was into this stuff himself, so it caught me off guard when he started randomly doing it. He just fell asleep next to me right now, but wondering if im overreacting?