Am I pregnant or just FAT?!

I am ttc 1st baby for over 2 years. Just turned 33 on the 10th. My period was due on the 6th. Itsnot here. I have very regular periods ranging from every 28 days to every 32/33 days. I have never missed a period in my life. I have been 12 days late before however. But this time I can feel that MY period is not coming. I don't know why. I have tested negative. Is it because I'm almost 300 pounds???? 😩(I don't look like it tho, but still). Is my weight finally effecting my period? I'm sad. I want to be prego so bad.

Omg!

*oh and I had sore nipples for a few days before my period was to begin