What are some reason for spotting one week before your time of year is due?

unprotected sex has occured but not around ovulation or fertile date, intercourse happened 2-3 days after LMP
Answers:

PLEASE HELP ME IM DESPERATE!?

I too have that experience. You may be experiencing miscarriage or you may be pregnant. Only about 30% of women experience spotting when they are pregnant. Mostly, spottings arise if miscarriage is taking place. I thought that time I be pregnant, I went to the doctor for check up. Yes, I be pregnant, but the doctor told me i will only hold about 40% randomness of having the infant because I was have some spotting for 5 days. And she was right after 7 days, I have a blood test and my hormones go down and I wasnt pregnant anymore..i had miscarriage. So you better progress get a blood testing to determine your hormones and consult the doctor before it's too belatedly.

Is boob size really that important?

go to your gyn for an exam and STD conducting tests. always use a condom.

Can someone update me what might be wrong with my belly?

If it is very restrained - it could be implantation spotting. Or like others hold said it could be a miscarriage. Other thoughts would be if you have be under closely of stress or taking any medications that could through your body out of stability.