First of all, you must do as others have so wisely suggested, and find out if you are indeed pregnant! A test should tell you quickly, and put your mind at ease (or not), one way or the other.
I experienced the same situation at age 20, my first sexual relationship, with a fella with whom I felt deeply in love, only to hear from him when I truly THOUGHT I was pregnant.."I can't help you!!!" I manifested all the signs of pregnancy, from morning sickness to swelling of my lower abdomen! I was not pregnant, but no over the counter pregnancy tests existed at that time, and I spent a month or two thinking I was pregnant! I had been raised in a religious household where my mother told me if I ever got pregnant out of wedlock, it would "kill her!" She told me this many times, and I had such fear of becoming pregnant. I suspect you feel much the same, and since you have been on birth control, switching, I suspect you are NOT pregnant, but going thru much the same as I did.
First, find out if you are or are not pregnant. Then, listen to your inner voice about this fella with whom you are involvedl!
Abouit abortion...at the time this happened to me, in the early '70's, I actually sought out the only source of abortion at that time in NYC. Thank God, I didn't have to go thru with it!!! But my cousin did find herself pregnant, and I put her in contact with the clinic and she went thru with it. She has regretted it ever since, and probably blamed me for giving her the information. I'm ashamed to this day that I was the one who enabled her to do this. The scars of this are lifelong....though she begged me to help her at the time.
Patty