Help!! I Dont Understand Wats Happened.. Have I Misscarried

ok since i last posted i have been to the doctors and she put me onto levlen ed 28pill however she stated that i could not start taking the pill till the start of my next period and since i was half way throught one at that point it ment i had to wait a month before starting the pill. after a month went by i was all ready and prepareed to take the pill and have my period and then nothing so i assumed a few days give or take wouldnt matter when it started ..... then after almost 2 weeks i decoided that it was odd for it to have been regular sor the 1st 3 months of the year then nothing so i did a home pregnancy test which came up negitive much to my parter and myown relief however we waited a little longer and still nothing then on of my coworkers suggested that i just start taking them as though it was my period and hope it kicks in well so far it sounded like a good idea so i did. when i go to the next round of white pills i noticed my period starting a big relief however when i was last in the toilet i noticed that on my pad there was a strange looked membrane upon closer inspection it was mostly white and see through with red clots on it now i must admitt that this has never happed before to me and i was not sure if it was part of the medication or if i had actually been pregnant and taking the pill caused it to misscarry. any information that can be shed on this would be gretfull as i dont know what to think my breast have been slightly tender and my stomach was a little bloated however i put that dont to the period onset .