What could it be?

I am ttc for 5 months, and have never had any spotting at all.I am now in my fertile days and have noticed some light brown spotting when i wipe and some in my knickers. I dont think its proper spotting tho because I have been experimenting with using other objects apart from and a vibrator, the latest being a banana ok please dont laugh hehe i am guessing this could be the reason I have had a little light bleeding?