Hi Secret,
You don't have to be exact with when you take your pills. Within an hour or so is fine.
If you miss a day, with most birth control meds you are supposed to take it when you remember and take your next pill as scheduled. Ask your doctor what to do if you forget in the future.
You can have have tingling and cramps after having sex. Your body isn't used to having a penis in it.
Don't lie to your doctor either. She needs to know the truth. She's should respect your privacy and not tell your mother. You need to wait at least two weeks from when you had sex to test.
But, the bigger problem. In most parts of the US and other countries you can not consent to having sex. In effect, your brothers friend raped you. He can go to jail for a very long time. It's called statutory rape. Your mom's boyfriend is very smart.
You are being used Secret. These older men only want one thing from you and you're providing it. You can't support a baby now either. Think how much better you could provide for a baby once you finish school.
Sorry about your mom.
Good luck.
Not necessarily. It is very early for any signs/symptoms of pregnancy.
You said you stopped taking the birth control pills. More likely what you are seeing is a "withdrawal bleed." It is normal. It's the same as if you had finished the active pills after 21 days and started taking the 7 days of reminders, you'd have period.