Birth Control

I was on Cephalexin for a misdiagnosed UTI. I took my last one last Monday. I was on my white pills at the time. I had intercourse with my fiancé over the weekend and the condom slipped down a little but not completely off. He had not ejaculated and we changed the condom after that. Should I be worried? Every source I have reached out to says there is no evidence of support that cephalexin interferes with Sprintec but I just wondered