Spotting and period late! Help!!

michelle

So my period is now one day late. Negative pregnancy test. I’ve been very very lightly spotting for the last 3-4 days. We’ve been ttc for 4 months. My last few periods I’ve spotted 1-2 days before and then gotten my period. This time the spotting has stopped and no period (plus it’s been going on much longer). Could I be pregnant? Or what else could be going on?? I’ve never spotted in my life before so I’m just really confused. Help!!!