Is it normal if you had brown stuff on your underwear for one day and then red spots the second nothing third day?

It is possible that these observations could be related to your menstrual cycle. Brownish discharge or spotting can sometimes occur before or after menstruation due to hormonal changes in the body. This can last for one or two days. The subsequent appearance of red spots could indicate the commencement of light menstrual bleeding. However, if you experience ongoing or unusual changes in your menstrual cycle, it is always a good idea to consult a healthcare professional for evaluation and personalized guidance.