Depending upon the rate of menstrual flow, your blood (and blood tissue) can appear red (if fast) or brown (if slow). The more time your body has to break up the blood, the slower the rate of flow, and the browner it will appear. It's also normal to spot between menses.
Abdominal pain is a bit trickier to consider. After all, what's painful for you might not be for someone else. The more important question is whether this pain is cyclic or new & different. In other words, is this pain regularly associated with your menses? If so, it's less likely to be worrisome. However, if it's new, then you should get evaluated by your family physician. Good luck!
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