I think birth control is making me emotional

I don’t know what’s wrong, I just started birth control two weeks ago and the week before that I took plan b, that’s when I decided to get on birth control. Anyways, today I was suppose to see my boyfriend but I called him hollering told him that I felt like he was rushing me, and this was out of NOWHERE. So then I apologized, and then started yelling and crying and hung up. And then called him back... and then went home and cried for about 45 mins, in my head I’m like why am I crying?? This is stupid but I could not stop. We argue, but now it’s everyday. And people are always saying I have an attitude now, idk what to do. I had to make myself stop crying today. I was thinking “am I pregnant” and that made me cry more