This is typical. You tripped the night before last, and your serotonin receptors had been downregulated by the last trip. This caused your brain to be tolerant to the effects of LSD and thus you didn't trip, and this is what happens for most people. Some people would tell you that if you wish to trip two days in a row to increase the dosage, and I've known some people who were of this school of thought. However myself and many other people would recommend not tripping within several days of the previous trip (to ensure the tolerance subsides). In my experience, not spacing your trips apart causes the experience to have a different, possibly even paranoid vibe and largely lack in visuals, if you're even able to trip at all.