YES, this can be normal - just because it is different for you this time, it does not mean is is bad. And, if you look at my previous answers I have given you all the reasons for something that can possibly cause a change too if there happens to be a change.
I would be happy to explain in detail how you go about checking for any specific abnormality.
To check for a Polyp you either do a Hysteroscopy - a camera in the uterus, or a SIS - Saline Infusion Sonohysterography - essentially an ultrasound with a ballon in the uterus (on a catheter) - if there is a polyp then the polyp should be removed and usually done via a D&C or resectoscope when doing a hysteroscope.
And, then other reasons for bright bleeding do include changes to your hormones - but this is not necessarily bad - this is quite normal infact.
And, sometimes we do see infections with 'lesions' to the vagina and cervix that can cause.
And, doing a D&C can also check your uterine lining for any abnormalities such as hyperplasia.
Thank you for your questions.