what's going on sorry post is kind of long

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I'm 3 months PP n on the 9th i started what I'm assuming is my period. Its been weird but I'm sure that's to be expected being that I just had a baby, what I am not understanding is why I am getting heartburn again and why I am feeling so tired I am not bleeding heavily if at all I have been spotting most of the time and only when I wipe and it's very light pink it was red at a point but nowhere near like a full-blow period Is supposed to be I am getting slight little pains in I guess you would call my ovary area I checked my cervix and it is closed and very high again I am not sure if that is normal being that I just had a baby as well but I thought when we had our period r cervix is open to allow the blood to flow I guess what I'm asking and trying to find out is if all this is normal or maybe I should take a pregnancy test but being that I bled a little over a week even though I wouldn't call it a real period I'm assuming pregnancy is not an option has this happened to you or something similar I really don't understand where the heartburn is coming from cuz that stopped the day I had my daughter and it barely started back up 3 days ago and today I have been more tired than I have been since my second trimester