I think I got my period but I don't know there is this brown stuff in my lundies (underwear! ) and it looks like poop!! Is this normal?!

It very well could be normal. Usually the beginning and sometimes the end of a period can be brown. It's called old blood and tends to happen before the bright red bleeding begins.

First, may I call your attention to the guidelines for using the comments feature found here:

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You gave J_9 a negative comment in another thread because she didn't answer a question similar to yours posted by another member. However, in that case, the member had not given enough info to accurately answer, so J_9 had requested more info. Your negative comment was unfair and inappropriate. You owe J_9 an apology.

That's the old blood cuming out u get it before your monthly and after its normal