welcome to HCM.
You did several times unprotected sex and took i-pill. Pregnancy
test may be negative in early wk.
As you got pregnancy test positive in later wk with mild bleeding,it may be due to early implantation
You do a blood test
for beta hcg and confirm with USG lower abdomen to rule out product of conception if any.
Then consult with your gynecologist and take advice accordingly.
Be well and practice safe sex in future.