Without penetration, and with the i-pill taken within hours, this bleed is unlikely to be anything to do with pregnancy. What you're describing fits the i-pill itself, which commonly brings on an earlier, heavier or crampier bleed than usual, or shifts the whole next cycle around.
Next Steps
Let this bleed run its course and track when the next period actually arrives. If it's very different again or doesn't settle into a normal pattern over the next cycle or two, please consult a gynaecologist.
Health Tips
If the bleeding gets heavier than usual periods or the cramping worsens, take a urine
pregnancy test and get checked, since very rarely such bleeding needs a pregnancy or ectopic pregnancy ruled out.