Keep an eye on it and rest. Typically brown is old blood and not a concern. Red blood is new blood and more concerning. You can always call your provider in the morning.
Spotting can be common in early pg. Call your Dr in the morning and try to relax in the meantime. The only reason to go to an ER is if you are filling a pad an hour or in excruciating pain. They can't do anything for you otherwise.
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Re: Just had brown discharge freaking out!!!