I think theres a spirit in my house.

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Now im not expert, ill openly admit that. But... I woke up as normal and came down stairs, my mother asked ' Did something fall onto the floor last night whilst you were asleep, I heared a bang on your floor' I went upstairs to check there was nothing on the floor. And I found nothing, but then I looked again and there was a penny on the middle of the floor, it was closest enough to have come from my bed. But last night I took the duvet off my bed and shook it over the bed before I actually got into the bed. So theres no way it could have been on my bed, or in it. Ive heared that spirits leave pennys to mark their presence. Im unaware if this is true. About 10 minutes ago I went upstairs to get my boyfriends jacket, and my bedroom was ice cold. No windows in the whole house are open and the central heating was on. Also I have a fish tank in my bedroom for my goldfish, and whenever I stare at the tank I hear little taps coming from it, and it cant be my goldfish tapping to me! Im too scared to go to sleep now lol! Someone just tell me if this is pure rubbish, or do you think theres a spirit in my house? Thanks x