Am i supposed to continue with fasting after spotting a drop of blood caused by contraceptive medicines?its not heidh its happened several days

Is it permissible to continue fasting and praying after spotting a small drop of blood caused by contraceptive medicine, considering that this is not menstruation but rather irregular bleeding that occurs intermittently over several days and stops after the initial drop? I understand I can complete ghusl and pray, but I am confused about whether this bleeding can affect my fast.