I have been using the patch for about a year now. I underestimated the ammount I had and ended up running out when I went to put on on my change day which is friday. I ordered more as soon as I realize but I didn't get them until tues. I put one on that night but friday it fell off. I put a new one on because that was my change day anyways and left that one on till next friday and changed it to the third one. My boyfriend and I used condoms up until the thrid patch week because it said we need a backup for the first week. I'm a couple days late and I was wondering if this was because of me messing up the patches or if I am pregnant. I was suspossed to get my period on monday. I have cramps like I always do but I haven't actually gotton my period yet. Thanks for any help!