Spotting while talking birth control


Hallo fellow ladies!

So as u can understand I have gotten some spotting while being on birth control. My period before that lasted longer than usual (7 days, i usually have 4-5 days of period) it also came when I were still taking the hormonal pill! When googling this people said it either were harmless or it could be a STD. so should I be worried is my question?

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