Hi!
Vikyy has some good advice for you! Nothing is impossible when it comes to pregnancy!
It is unlikely to get pregnant so soon after, but some women do ovulate right away.
It almost sounds like your boyfriend wants a baby! Have a long talk with him about your future together! Then, if you decide that you two don't want kids right away, your regular doctor or the abortion clinic can prescribe some birth control for you. Condoms are also important, as Vikyy says. Having too many abortions can damage your reproductive organs and cause future problems, so take care of yourself, and don't count on him!
Good luck!
Dr B
The 'pulling out' technique will not protect you against pregnancy or sexually transmitted diseases at any time you have sex. Condoms are the best way to protect against STD's and will also protect you against pregnancy but there is a slight chance of the condom splitting so I would suggest you go see your Doctor and talk about birth control. This will be the best for you and prevent further unwanted pregnancies. So please use condoms and birth control to protect yourself.