No. Two texts in a row is normal human communication. People double text their friends constantly and nobody spirals. The double text turns dangerous only when it changes jobs: when message two stops carrying information and starts carrying panic.
So the useful question is not "how many texts is too many." It is "what is this text for." A follow-up that helps them answer is communication. A follow-up that punishes them for not answering is something else, and your phone cannot tell the difference. You can, if you pause long enough to check.
Notice what the popular advice skips. Every dating column answers "is it allowed," hands you a rule about hours, and stops. But if you searched this at 10pm with a draft already written, permission was never your question. Your question is why the urge feels unbearable and what to do with it. That has an answer, and it is more useful than a rule.
