help for a friend

Mera

I don’t know a lot of details because my very close friend doesn’t tell me anything but my other friend tells me what’s going on. So she went out had sex with her “fwb” and she has not had her period, she is on birth control but she has been doubling because she kept forgetting. From what I was told, she has taken pregnancy tests and they came back negative, and took a plan b. Is she pregnant? or what?