could I be pregnant???

Cassie • sup
okay so my bf n I had sex on all my fertile days last month n this month af was due on the 15th but didn't come until the 19th but only light flow for that day n the 20th???  n now on n off all day today I've been having a light brown/pinkish discharge but after countless bfns n a miscarriage in jan I'm TERRIFIED of getting my hopes up again :(  what does everyone think?????