I'm 19 years old, and I do think I have my priorities right. I'm at university studying a degree, I live with my parents, don't drink much, don't smoke at all and have never taken drugs. Right that's the introduction over

I have a wonderful sexual relationship with my boyfriend of 2 years.
I have a particularly fussy body, that likes to react negativley to contracteptives.
I've been on 3 different types of contraceptive pill, each different one made me depressed/gain ridiculous weight,/and have headaches. The contractepive injection Depro Provera proved not to be for me either, since I retained over 6lb (and growning) of water over 6 months.
I've finally found the pill for me though ladies. It's a progesterone only pill named 'micronor'.
My story (well my little confusion) begins in November 2006. I was going through a rough time, I was just settling into university, and was moving into the halls of residence there (which consequently I left after not a long while, as I was disheartened by the drunks that threw up on my doorstep, and threatened me for no reason) and basically I was stressed. The catch with the micronor pill, is that you have to remember to take it at exaclty the same time every single day, no breaks.
I made a few mistakes, and went to bed, exhaused and forgot to take my pill. I did this for around 2 days in a week for a bout three weeks (Yes I undertand that it was very silly of me, and lord knows I regret it). As a consequence I had several periods back to back.
I began to notice at the beginning of December that I was gaining weight. I dispiared since this was the season of good will and parties, and my birthday is in December, I had abought a lovely dress to wear, and I was terrified that I couldnt fit into it. I blamed my pill, as this was the cause for my weight gain the past two times. I was unable to see my nurse over the christmas period, and I stopped taking my pill. This was silly of me.
Me and my boyfriend have not had sex AT ALL whilst i've been unprotected. But we did during the time that I was forgetting my pill, but I can assure you that every occasion was protected. I am such a cautious person, and miss beng intimate with my boyfriend.
Since I stopped taking the pill, I have not had a period.
I am very worried. I am putting it down to having several periods at once in November. The date was the 18th December when I stopped taking the pill.
Can anyone please give me any advice.
I've never done a pregnancy test before, since I am so careful.
I am frightened.
Thank you xx xx Steph