Conversely, sell some BTC and buy some BCH. (I'm low on money, so if that's possible for you I'd prefer that.) Either way, it's BCH, not BTC.

It's really not good that there's been so much drama regarding which one is Bitcoin, and this exact issue is what I conversed with Henry Romp about, linked to in this video. And this is the exact link to the directly-relevant comment.