Faint line for a week..

I am going crazy!! Ever since my MC and D&C in October my cycle has been around 35 days every month.  Last month my cycle was 26 days and I was so excited my body was finally back to normal.  This month I felt nauseous and dizzy so I thought for sure I was pregnant.  I took a test the day before my period was due (last Sunday) and I got a faint line, but then I took MANY more and all were definitely negative.  Now a week later- I took a test this AM and I swear I see a faint line.  Technically I am a week late but no sure since my cycles have been long most months.  Could I be pregnant? Or if it was faint last Sunday and then again today was it a chemical or something? I'm my see what to think anymore!!!