Opinions!

I’m 4 days late on my period. I had a baby 4 months ago and got my period back 2 months ago. The last two periods have been 31 days in between. 2 days ago I thought I had started but I ended up just spotting for the day and that’s it. Could I be pregnant again.? Should I take a test? My life is particularly stressful right now so I thought it was stress but 4 days? I’m not sure where to go from here.