Help from those that have had implantation bleeding.. help!

Nicole • Trying to conceive since August 2016

I’ve had 4 different days on and off spotting I should be expecting af on 4/16 (Monday) sometimes before or after.. could that have been IB or something normal. I’ve never spotted before a period, ever. Been ttc for 2 years. Really wanting to test but I don’t want to test too early. Thoughts? Could it really be implantation bleeding/early pregnancy signs?