impantation?

Jess • Mama to Ava and Maxim💗
Hey ladies!! So I was SUPPOSED to get my period the 14th or 15th and no signs yet. Woke up this morning and when I wiped I had light brown/ light pink discharge and figured I was starting my period (really happy because my doc is doing blood tests on CD3 to figure out why I haven't conceived after 2 years of trying) and so I put a panty liner on and made my way to work. Around 10 I used the restroom again and there was NOTHING, using it again and NOTHING. What do you guys think? 
Ps. Period is pretty irregular so it shows up when it wants to most of the time but I still get it every month!