Took my day 7 birth control pill ortho tri lo. Am I safe from pregency?

In theory you are if they were taken properly. Each woman is different and there are some cases of women getting pregnant on the pill who thought they were taking them properly. Make sure you take them as close to only 24 hours apart as possible. Also, ask your pharmacist for a list of medications that might lower the effectiveness of the pills you are on. Make sure you don't drink to a point where you get sick to your stomach, as throwing up soon after taking your pill will also leave you unprotected. If you take your pills correctly, they are 99% effective. If you take them correctly, you are protected even while on your period. Make sure you start your new pack as soon as you are through taking the inactive pills.