Should I get HF lust w potential new HF in less than a week?

I just got to 16000 vivid dust today, but I’m not sure if I should buy hf lust or wait to see if next month we get a new hf. I have both persi and pride which look like the two most likely pets to get the new hf, so I’m not sure if I should wait to buy one of those or get hf lust now.