period confusion

I recently started getting periods again (daughter is 16 months) and I've had 4. Well I'm one day late right now. I've been cramping these past few days, and now I have VERY small light brown dishcharge. Like I wouldn't have notniced if I wasn't constantly checking to see if my period is starting.
A little concerned because I felt like my period was coming on when I was pregnant with my daughter. I took a Walmart cheap test yesterday and got a negative. I'm going to retest Monday if no period or should I wait longer? I only am freaking out because I'm pumping a lot and taking fenugreek and I'm unsure if it's safe during pregnancy.