No, not at all, unless you are setting unclear expectations at any point. Probably review this article just to be sure:
Any time sex is happening faster than, say, 7-10 hours of face time with a woman, and fewer than 4 dates, you're usually safe by default, unless you really go overboard signaling you'll be a boyfriend. There are exceptions for younger and less experienced women... but if she's old enough for drinks at a bar, she's usually old enough to not think a guy is going to automatically make her his girlfriend just because she went to bed with him. Occasional exceptions for mentally unbalanced women, of course.