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Thanks to share your Problem
You cant be pregnant if the sperm and egg never connect. Sperm only lives at most five days. If it is an old dildo you have nothing to worry about.
You can relax because it's not physically possible to get pregnant without having sex. Sperm can't just appear out of nowhere without a boy attached to it.
At your age it's very very common to have irregular periods for several years until your body gets on a regular schedule. Since you're going through puberty right now your hormones are literally all over the place and will be for several years. It's totally normal and not something for you to worry about.