My period is late by Two weeks, which is strange since It's very punctual. I've taken Two blood test, both have come negative. I feel fatigue all the time, even when I wake up in the morning. Lately I've spotted some brownish spots in my underware, somewhat like blood but in brownish color. Is there posibility that I might be pregnant, even though blood test confirm that I'm not?

Possible, but not likely. It may just be an off period and you are going to start late, or you may skip this month altogether.

See what happens. If you don't have a period for next month either, than see about having another test done.

It is possible - I fell pregnant last year without knowing & by the time I realised I might be, had a miscarriage. Had no idea & all normal signs for period were there... but I was.

How's your weight? Have you lost a lot recently? Are you super stressed out? These things can cause your period to be late.

Too much exercise lately? This also causes your body to skip a period or have them come late.

Brown blood is normal for a period - it can mean that your body is 'hanging on' to this one for some reason (stress for example) however nothing to be alarmed about.

Any cramps / pmt / usual signs of your period coming yet?

Drink some chamomile tea every day - it's a nerve tonic, will calm you down, calm your nerves (coz you're worrying about it) & also take an iron supplement if you can (something that's not a tablet - you can get water based ones that are quickly absorbed) to help with your fatigue. Also Vitamin B12 is good for fatigue.

Check your diet - more fruit / vege, less processed crap. Double your water intake. Get a bit more sleep.

If you're not pregnant, which doesn't sound like you are, but if you're not, a week of doing these things, you should be right again.

Try not to worry - sometimes the body has a little hissy fit every now and again. It'll be OK. I had similar lots of times when I was younger - always thought I was pregnant but never was.