Yes, you could potentially be ticketed: the police do not have to personally witness a violation but can  rely on credible witness testimony or other evidence (e.g. the bus driver's testimony; any photographs he took). That does not mean that you necessarily will get a ticket, however: first, the driver would have to report the incident to the police; the police would then have to take it seriously and choose to issue a ticket to you.If a ticket is issued, it will be your word vs. the driver's, unless one or both of you have additional witnesses to bolster your word, or unless there was some video or photographs showing the position of the bus's stop signs at the time.