PLEASE ANSWER!

I asked a question the other day with no answer:/ I’m on Blisovi 24 combination pill birth control. I’m currently spotting on my 2nd week of the pack, but this is my 3rd month taking it. The spotting started Sunday night, went away Monday, and now it’s back. I had sex on saturday night and Sunday morning, but he never came in me. I’ve never missed a pill, but I did take it a little late on Saturday. I was also on antibiotics for a UTI 2 weeks ago. The spotting is very minimal, not very heavy at all. I know spotting on the pill is very normal, but It’s never really happened to me before so I’m a little anxious. Any advice would be great. Thanks!