Pregnant?

I started birth control [ trinessa ] 21 days ago.
I had UNPROTECTED sex [ for the first time ] when I was thirteen days into taking the pills. So, it was just one day under being 2 weeks that I had been taking the pills for. Some people say you have to...

take the pills a whole month before they start working, so I don't know about that.
Also, that night we had sex was a week to two weeks BEFORE my period which means I might have been ovulating.
I haven't gotten my period yet but I HAVE had really light brown spotting and I have like a tearing feeling in my lower abdomen. Sometimes, when I walk around, a lot or even at random times I feel like I need to puke, but I never do. This especially happens when I first wake up from sleeping and stand up. I also get dizzy a lot.
I get hot and cold randomly, need to pee more often get tired SO much more easily.
I have not taken a test, yet. I am going to tomorrow.
What do you think about all this?

Could be pregnant. Could just be in your mind. I'd take the test to make sure.

Those sound like symptoms of being pregnant, actually those are the exact same I had. Get a test asap

im pregnant from having sex only once, in a month, and yes I was 2 weeks before my preiod, and I had to pee a lot more, Very light light brown spoting happend to me and thats all, my dear you have the same symptoms that I have and had, so I do believe your pregnant... Take a test to make sure, stop taking the pill.. and I hope everything gose well I know your only 13 but a life is a life, and you have one growing everyday inside of you (maybe) soo just take things seriously..