I had my menstrual cycle October 9th and then started again on October 24 has...

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...that ever happen to someone? So i keep track of my menstrual and for some reason i started my menstrual on Oct 9th it was a normal menstrual i usually go for 5 days. But then i started bleeding again on October 9th i didn't even get cramps or bloating no breast tenderness. I took a pregnancy test it was neg made a doctor appointment they said everything looks normal and good.I have always been regular this hasn't ever happen to me so i was freaked out. My next menstrual should not have came till Nov 7th i wasn't sure if it was thrown off cause i was stressed out and i had moved and work had been crazy. Someone told me that it could through it off if any of those things happen. Now i feel like I'm going to start so i just wanted to know if anyone else has had this happen to them? I wasn't sure if it made it come sooner cause my partner and i had been having intercourse. Just wanted to know if this has ever happen to someone or if i should be worried