When to restart pill after one missed period?

I am 29 years old and married. I have been on the birth control pill for 8 years; 4 months ago, I switched from Sprintec to LoestrinFe.  My period has always started on day 2-3 of the "placebo pills."  This time however, it has been 7 days since I started this latest round of placebo pills and no period; in other words, I am 5 days late.  I have not yet restarted the LoestrinFe "regular" pills yet.  I took an OTC pregnancy test 2 days ago, which was negative.  I know that one missed period can be common with birth control pills, but this has never happened before with me; I've always been on time like clockwork. However, I did recently switch to a new brand of pill.  If I am actually pregnant, it would not be a bad thing; it would just be a little earlier than my husband and I had planned, and we would definitely continue with the pregnancy.

My question is: when should I restart the next cycle of pills?  As I said before, I have not yet restarted them, in case I am pregnant.  I will try another pregnancy test next week, but should I restart the pills in the meantime?  If I were pregnant, I would continue with the pregnancy.  However, if I am not pregnant, I want to continue with birth control.  If I am pregnant, will restarting the pills now and then possibly stopping them (if the pregnancy test is positive next week) harm the fetus?  Or should I hold off restarting the pill until I definitely have a period, which may be another month?  That wouldn't be the end of the world, just awfully inconvenient.  

Thanks.

[Kim1989]

you would restart them at the regular time you normal would.....after your next period.

if you are pregnant then dont take the pills. women have gotten pregnant while on the pill but use your head and if you think your pregnant then dont take them till your sure.