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I'd say no worries if it's in the range of 20-40 nMol/L. But it's not as though dropping into the teens is guaranteed to cause problems. However, if it corresponds with TRT then it could be an indication that your dose is on the high side.

I encourage you to seriously consider twice-weekly injections, and better yet would be 40 mg TC each time rather than 50 mg. The problem with once-weekly is that your peak serum testosterone in the day or so after each injection is two to three times higher than the pre-injection trough. There's some evidence that this pattern contributes to side effects, such as elevated hematocrit. With twice-weekly injections the peaks are reduced to more like 50% over troughs.