Good Afternoon my name is Jessie and i'm 29...

I started my birth control on Sunday Feb 14 (Zenchent 0.4/35) as I started my period on Feb 12th....I completed my first pack and started my next period on March 8th which seemed normal as far as the cramping it was easier and the bleeding was a little lighter...then started my next pack on March 14th...then on Monday March 22 (15 days later) I started again only on week 2 day 2 of the next pack...my normal cycle usually last about 5 days with very little bleeding...so today Saturday March 27th I am still bleeding and it has not lighten up at all...Tuesday night i passed a big clot..I usually notice some clotting during my periods but not bad...this was a big difference..I called my dr and his nurse said it was normal...I have a appointment on Tuesday March 30th to have a laser colposcopy done...each day that i have gone to the bathroom while using the bathroom ive notice more blood in the toilet..the nurse told me its really nothing to worry about and that it may be breakthrough bleeding however im starting to get worried now...

Also, one other question that is on my mind...since December while having sex I have noticed bleeding for maybe a day or two...but its not much..what could be the cause of that?