3 Ways to know your girlfriend has ab0rted before,GUYS click to read to find out if your girl has committed ab0rtion before.READ my point well.

Yes, it is possible to have an abortion without your boyfriend knowing. You will be instructed by your medical provider not to have penetration, va ginal s*x, and receptive an*al or or*al s*x for 2 to 3 weeks after the procedure. This is critical, since you may be bleeding during this time, and micro_organisms can get more easily into the reproductive tract under these circumstances, creating risk for infection.

Examine her body?
If you are a trained professional then yes, you can usually tell if a women has had a baby upon examination, it's pretty easy, but a lay person generally would not be able to tell for sure. Except of she has a c-section scar! That would make it obvious.
As for an abortion, that's pretty difficult. A full internal examination by a doctor might reveal something, but maybe not. Again, a lay person would have no clue.
What's the big deal? Here's how to find out: just ask her.

The only way for someone to determine if a woman has previously had an ab0rtion would be to have a doctor examine her uterine wall for surgical scars left during the procedure. You would be unable to tell from the outside, and without the proper medical training (and permission) it would be difficult and unwise to try looking for them inside.
I'm not sure why you're interested in finding out, but depending on your situation, it may be more feasible to look for papers that documented the procedure (Medical records, insurance records) though she may have destroyed these if she is trying to hide an abortion.

There is no way to know for sure if a woman has had an ab0rtion or birthed a child. The best way is to ask....and if she don`t trust you enough to tell the truth, you probably shouldn`t be with her.
Ask her... It's up to her whether she trusts you enough to be honest.