ok. so me and my gf started to get aroused, and imitated sex. I finished inside of my boxers and shorts while she had sweatpants and underwear on. We waited five-ten minutes or so and we started having sex with no condom. She thought she was done with her period but she spotted she said when we were done with sex. However, she has been on the pill for 3 months or longer.
Questions.

Can the sperm from my boxers somehow stick to my penis and transfer to her? Even though i never finished inside her during the sex.
Will her miss reading her period affect anything? Even though she has been on the pill for so long?

help me...