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Could I be pregnant or could there be something else wrong?

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I have always had regular periods and sometime it can come a day or two late which is normal for me.
My last what I thought were periods have all come a week early and I get a good amout of clotting when I get my period and I have had none the last 3 periods and they have also been a lot lighter and only lasting half the time as my normal periods.
I have 3 sons and I feel like I did when I was pregnant with them but I did a pregnancy test a week and a half ago which came out negative.
I know I should get ahold of my doctor but I have been calling him for a few weeks with no responce and it's hard to go to a walk-in clinic with all 3 of my kids.
Has anyone else had this happen?