My boyfriend and I had unprotected sex on the 20th I took plan B the next morning no symptoms after everything was fine. I started spotting yesterday on the 25th and now it has turned into a regular period. Only reason I'm having some questions about is this is because period isn't due for two more weeks and I'm extremely regular. I've read the symptoms online and early periods one of them but I just didn't think it would be this early? For people who have taken the pill has this happened to you? What were your experience with having an early period? How common is this?

Thanks for the help.