Lo Loestrin Fe, First month done and no period

Megan

I took my pills every day at the same time, I had breakthrough bleeding for a week or so in the middle of my cycle, and i bled brown blood with clumps for 3-4 days when my period should have came but I never got a definitive period. It’s my first month and I am now on my second. I took a pregnancy test and it came out negative. Could I be pregnant?