good news!! She had her period last night!!
I seriously doubt she could get pregnant from the behaviors, and also she did plan B. So I'd say no.
I think it's likely Plan B too. Often causes mild - fairly severe nausea and vomiting.
she is sick at the moment and I’m scared that it might be a sign of pregnancy. But i think it’s because of the plan b
No, this is NOT how women get pregnant. For any realistic chance of pregnancy, you would need to put your penis inside her vagina, and your finger is NOT a penis, or anything like it. Sperm do not remain active enough to cause pregnancy, once they are outside of the body.
Your girlfriend should not have taken Plan B for this no-risk situation. Plan B can disrupt a woman's hormones and menstrual cycle, which is not a lot of fun. It is called emergency contraception for a reason - it should only be taken after a REAL risk.
If you are considering going further, sexually, with your girlfriend, you should both be asking questions and be knowledgeable about risks for pregnancy and STDs, and how to prevent both. As a start, you should consider carrying condoms just in case you decide to have intercourse.
Please let us know if you have other questions. We're happy to help!