Is this normal, for an irregular cycle or for any cycle?

Ever since I can remember, I haven't had a regular cycle. I started back up last year, and since then the cycle's are weird. I've never been regular, as I said, which I'm not worried about. It's when ever I get up from a laying down position, I feel something drop, and I'll check and there will be a small dollop of blood on the pad. Is this Normal?
 
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