Light pink spotting at 33 weeks

I already called the nurse and they told me to go in. I am highly doubtful it's anything other than me straining too hard, or a blood vessel or something. There was only very light pink spotting once when I wiped, but they still told me to go in. Anyone else had this happen? What was the cause? I'm trying to talk myself out of going but on the other hand I would rather be safe than sorry...I just don't feel like I need to go to L&D like they want me to.