*DAYS... typo in my second sentence.
Skipping pills can cause some serious damage to the normal cycle. i missed a few months, then had to stop taking the pill until i got a pelvic exam to renew the prescription.. which lead to two months of no birth control. the last month that i was taking the pill, irregularly, i also had unprotected sex... a lot of it right before my period was supposed to happen... day goes by, then another, then another... i started to freak out... bought 3 pregnancy tests. took one the day after i was late, then a couple days later, & a few days later once more... all came back negative, but i finally got my period THREE MONTHS LATER... when i started birth control again.
take another test, but don't freak out if it still says negative with no period to prove it.
I would test again, using first morning urine, as that's more accurate. If it's negative then it's most likely that missing so many pills over recent months has really messed up your cycles and that;s why your period is late. It's not good for your body to the missing pills like that, so that is most likely the cause if you're not pregnant.