No period after switching to lower dose b.c.

Hi -- I'm sorry, this may not be quite the right place for this, but the gynecology forum was full today and I'm hoping someone might have an answer for me...

I am 29, 5'4", about 138 lbs, reasonably healthy in eating and exercise habits. Have been on the pill for about the last 8 years, and two months ago when I went in for my annual exam I asked my gyno if I could switch to a lower dose hormone because I've gotten worried about all the stuff I'm pumping into my body -- especially since my fiance & I want to start trying for kids in another year or so.

I switched from Levora/Portia to Junel FE, and the first month I didn't get any period. I took two pregnancy tests a few days apart that both came out negative, so figured it was just my body adjusting to the new meds. Then month 2 came and went last week, and still no period. No sign whatsoever of any bleeding. I took a 3rd pregnancy test a couple days ago, still negative.

It seems clear that I am reacting to the new pills, since I was very regular previously and it's only the past 2 months on Junel that I've had this problem. I've seen a lot of posts about people having similar problems when starting the pill for the 1st time or going off it entirely, but none directly related to my situation, and my doc only warned me that I might experience spotting -- MORE bleeding, not less! So I'm a little worried, but relucatant to go back to the doc when I just had my annual exam (including pap, and everything came back healthy) and have been undergoing treatment for a knee injury -- don't really want to spend any more $ on medical things if this is a totally normal problem that will go away in another month or so as my body adjusts.

Any guidance you can provide is much appreciated.