Do all these symtoms mean i could be pregnant?

TTC so really hoping the test are wrong but really need some advice please??!!...

Okay so last NORMAL period was with last week of September (2011) or the first week of October, I can't remember now!

Thought I came on on 17th November as before I went to bed I noticed brown discharge/spotting when I wiped so put a pad in for bed. Woke up next morning and NOTHING! Only every time I went to the toilet and I wiped, there was a small amount on the tissue. This went on until the morning of 22nd November when I wiped I noticed a small amount of light coloured blood. Thought maybe this would be the start of my period so wore a tampon and next time I went toilet once again there was nothing! Same this as before, only blood noticeable when wiping! This all finally stopped on the 26th November! This whole 'period' I never had to wear any protection!!!

Took 1st pregnancy test on 28th November 2011 - came out negative. Thought I'd wait a week to see if I got anymore symptoms and incase I tested too soon. Symptoms carried on all week..... So took another test yesterday (6th November) and still NEGATIVE :(

I don't understand. Like its really wired I keep 'thinking' that I am pregnant but the 2 tests have come back that I'm not!

I'm still getting symptoms!....

**Ever since I finished 'spotting' or the light period, I've have 'period' pains/cramps!

**Ive had constant back pain and a few times it's been so painful it's even hurt to stand up. The pains right in the middle of my lower back! I'm now sleeping with a pillow under my back it gets that painful!

**Noticed blue veins on my breasts and I swear there are more of them white bumps around the areola!

**Woke up the other day with 2 mouth ulcers at the top of my mouth (never get them)

**Increase in clear discharge (sorry for TMI).

**Sorry for this one, but was constipated for 3.5 days last week and I never have trouble with going its normally once a day but even since last week it seems to be every other day!

**Shooting pain in my breasts while watching TV (took it in turns) that didn't last long but enough for me to notice!

**Got a basal thermometer today and took my temp and that was 37C/98.6F

**Strange twinges in the very tops of my legs when I lay down!

**Shooting pain every now and then near my vigina (I get that when I'm coming on my period sometimes)

**Since yesterday I've been getting these really painful twinges in my head, just above the right temple. It last for about 2 seconds but it really hurts and it keep coming and going!

I've basically been having period symptoms AFTER my period which is something that never happens?!

How can I possibly have all these signs and still not be pregnant? What else could it be?
Xx