@mrsleon,
That's not peak fertility but it's definitely possible.
It looks like the earliest that the drugstore-type pregnancy tests can measure is 6 days after conception. (That would be the day after tomorrow, Saturday.)
You should be able to get to Planned Parenthood on your own.
Any chance of talking to your mom about this? Whether you're pregnant this time or not, you're 14 and sexually active and practicing unsafe sex, and it would probably be better for everyone if you were honest with your mom and went from there.