she thinks it was weeks ago.. but the only time that we did it w/out her ring (birth control) and without a condom was after her period.
For about a week after the period, you are in the clear, because ovulation isn't until 2 weeks after the period. While sperm can last for 5-6 days in the vag, ruling out 1 week before ovulation, it would be INCREDIBLY rare that a sperm could survive 2 weeks.
Not to mention, all the other spermicide from condoms and the ring that she *did* put in.
She took out her ring a week late though, the week she should have had her period, so she is worried because she hasn't gotten her period.