Do it alone. But frankly, I'm sorry to say this, by having sex with you, your boyfriend committed rape. It's not whether you said yes or not, having sex with a 14-year-old is illegal everywhere in the world. Check the laws where you live -- you can repost this with your age and his and where you live -- it may or may not be a felony depending on the local laws and his age. If you continue the pregnancy, the baby would be DNA proof that he broke the law.
After this, get on birth control.