^how much did you decide on taking?
When I was in HS, I had an experience where I took 1.5 g the same way you did, at home. I was never really bothered at all in HS when I was in my room. If I went in there and locked the door, I was almost for certain I wouldn't have any hassle.
Anyway, everything went alright. No problems, great experience, fun, insightful, just the right dosage for the situation. Occasionally though, I would get a bit antsy and want to go exploring, but I knew I really couldn't because of the current state I was in. So going downstairs and grabbing a glass of orange juice would have to suffice. In short, although no real dilemma occurred when there was some brief interaction with the parents, it wasn't ideally the most comfortable (It's hard to explain using words, but it's the head space you're in. Not necessarily bad, nor good. Awkward is about the closest word I can get to the feeling). It's kind of "weird" to bluntly put it, talking to your parents while on Mushrooms. I didn't suspect they had clue, but from that day on I preferred to avoid it.