Pregnant or just my body getting used to birth control?

So this Sunday will be 2 weeks since I started birth control.

Before that the only method of contraception was pulling out.

My boyfriend has came inside of me but I had used plan b that time and everything was fine.

I remember one of the time before I started birth control he would pull out and then put it back in; which I know can still get me pregnant.

The first week of starting the pills I had spotting for maybe 2 or 3 days.

This week I have noticed my breast/nipples are very tender.

Now at the end of the week the past 2/3 days I haven’t had an appetite, when I try to eat I feel nauseous, or I feel full after only a few bites. I also woke up dry heaving this morning because I couldn’t eat last night and I just threw up what I ate 2 hrs ago.

I do plan on taking a pregnancy test just to be sure but I also know that these symptoms can just be from starting the birth control