Pregnant? No symptoms make sense , please help!

I had sex (about 10 weeks ago) then I took the pill about 40 hours after, then 2 weeks later I had a period, then 2 week after that another period, but now I am almost 3 weeks late.
During that time whenever I was drinking alcohol I would throw up (which never usually happens) and feel sick. I have also been having headaches and a lot of discharge. I did take a pregnancy test the other day in the afternoon but before it I drank 3 bottles of water quickly and apparently it can dilute it?
My sleeping pattern has been weird, a couple of months a go I was going to bed at about 3am and waking up at about 8am but recently I have been having about 12 hours sleep or more, but last night I couldn't sleep at all and felt sick.
I also had a itchy vagina the past month and went doctor thinking I had thrush (discharge being another reason for thinking thrush) but then she told me to take a pregnancy test to be sure. Now I am just waiting for the bank holiday to be over so I can go pharmacy, I just wondered if anyone knew anything it could be?
Thank you!