Advise needed, please help!

Hi,
I wanted to talk to someone/people that will be able to give me some advise on what I should do, as I'm really confused and worried.
My boyfriend and I were silly about 3 weeks ago and didn't use contraception but he didn't finish inside me, At first I wasn't too worried about it but my boobs have got quite tender lately and since last night I have had a pain, different to period pains, but in the same area. I have also been getting a bit tired lately which I read somewhere is another sign of pregnancy, but could it also be related to doing lots of college work?
All the symptoms I have are pretty much shouting pregnant but some are normal to me:-
sore boobs - could be growing as I'm not very big anyway plus could be near my period date
white discharge - normal...always had it so not worried about that
spotting - I haven't seen any yet but have been wearing black underwear lately so might not have noticed
tummy ache - slightly strange but could be hunger or constipation?
cravings - haven't been having any cravings but being hungry quite a lot is quite usual for me as during the week my eating pattern isn't always regular

When it comes to periods, I am never regular, give or take a week and a half which is making it difficult for me to tell whether the tummy ache is just normal pre-period pain?

Please could someone give me some advice as I am really scared and don't want a baby now or in the near future. I have just got a job as a trainee surveyor and don't want to lose this opportunity at all.

Thank you for your help and sorry its a bit long winded!!

Relax

First of all you need to relax and the only way you'll know for certain is to do a pregnancy test at home or visit your doctor and if you are pregnant it's not the end of the world it may feel like that at the start but it's not i went through 3 years of college with 2 small toddlers, So good luck and do that test before you drive yourself mad wondering and worrying.

Thank you

Thank you for this, a few people told me not to worry but I worry about a lot of things!
It did turn out that I was worrying about nothing...everything is fine now and seems as though it was just pre-period pains!...I'm definately not going to be a mum yet
Still thank you again!