So I've been talking to this girl in my class over the past two weeks and I'm fairly certain she's interested in me. I was planning on asking her out after class today, but by the time I got outside she was already talking to a friend and I felt like it would be inappropriate to interrupt to ask her out. The way I look at it, my options are calling her to ask her out, texting her tomorrow to hang out on short notice, or just waiting until next week so I can ask her in person. Also, her brother's coming into town for the weekend so I doubt she'd be able to do anything even if she wanted to.

I see pros and cons to each one, but I really don't know the best way to approach it.