הכרויות סקס|הקרויות

I've been seeing this person i met online for around a month, seeing each other a little over once a week. He (21m) asked me (18f) if we were exclusive two dates in, and asked me to be his girlfriend 3 dates in. I really like him and we seem super compatible so far so I, of course, said yes. At some point between our 3ed and 4th date he asked if I wanted to go to NYC with him for a few days about 6 weeks out, with his sister and her boyfriend. I also said yes to that because it sounds like a fun time and a good way to test our compatibility early on. He's met my parents and brother, I've met his sister, and I'm about to meet his mom tonight.

Keep in mind we call each other and text a lot, so it's not like we have really only talked like 5 times or something. My sister in particular seems to think this is progressing very fast, and seems concerned about nyc. Is this time line really that strange? Should I have told him no about the trip? I am very new to dating so I don't really have much in terms of reference points! Advice would be greatly appreciated!

Please feel free to ask for more context!!! Thank you!!!