Stomach pains while bf? Son is 16 months

Raeanna • 25 yrs old, full time student & full time mommy
My son is 16 months old and I still bf him. Lately, like past couple of weeks, I get cramps while nursing sometimes. Similar to that after birth but obviously my uterus isn't still shrinking at 16 months pp. I'm on the minipill and take it daily at the same time if that matters. I have had a period back in February and some spotting in April. That's it though. Could it be another period coming soon or what? Nipples aren't sore and no change in milk supply. Son still feeds same as always.