I had unprotected sex a couple of times at the end of Oct/early Nov.  I had a period at the start of Nov, but it came earlier than usual and was irregular.  I've been exhausted, light headed, nauseous, and my breasts seem bigger, fuller, and more sensitive than usual even though I've lost weight due to weird appetite (and the ladies usually get smaller when I lose weight).  I took a hpt, and it was negative.  I've read so much about hpt potentially being inaccurate, so I'm not sure if I should go with that or check it out further.  Does it sound like I could still be pregnant, or is it more likely in my head?  Any advice or similar experiences would be greatly appreciated!