Ladies please answer. When you know that you orgasm? What are the signs?

I have problem to know when she orgasm and try to
tender her arousal before my ejaculation but it is intricate and i am not sure if she is happy and sate or not or she does fake orgasm. so i entail some ways or technic which satisfy her. or know if she orgasm or not.
Answers:

Are the danger of Plan B true?

I think it vary from woman to woman but I personally do the following things:
arch my vertebrae...high
moan in pleasure
riotous leg spasms
and
i c**.
So any of those signs could lead you within the right direction.
As long as you are hitting her G-spot or giving her clitorial stimulation, then she should hold a real orgasm. Letting them build up is also a process to garuntee a memorible orgasm. Like letting her about to hit one and next stopping it before it happen. Also, she could do the same to you and by timing it right, you both can orgasm at impossible to tell apart time.

I didn't have sex but i perceive like i'm pregnant.!?

you can breed ur girlfriend have an orgasm by putting ur finger in her and rubbing her g-spot or buy sex toys