Weird period

Olivia • 19 • coffee lover ☕️ • Jesus adorer •
So I took antibiotics about 5 or 6 days before my period and the day before j took it me and my boyfriend had sex and he came inside me. My period started yesterday with one of my placebo pills left. I have now taken my last placebo pill and the past two days I have bled but it's been so minimal. Should I worry? Am I just paranoid?