
Congratulations on your first OBE, that is very exciting indeed. Often times the astral plane does not exactly resemble the physical plane and all of its properties. For example, if your physical body is extremely tired, it may have a different appearance than when it is rested and energized. You may even not see your physical body at all, and the landscape of your environment may change in the astral plane. Safe travels.
Great to meet you, please continue to enrich this forum and post on whatever you feel is worth sharing.
Speaking from experience, you would certainly know if you were out-of-body. It's an extremely visceral experience. However, that does not mean we keep the entirety of our memories when we come back into our physical body. Try keeping a journal next time for enhanced recognition.