Birth control issue

I’ve been on birth control since January of this year. I’ve taken it everyday sometimes a little later then normal but not usually anything crazy. I was having a procedure done in the beginning of July and my doctor told me to skip my sugar pills to avoid getting my period since I would have been getting it the day of surgery. I had started my new pack when I was supposed to but my pharmacy didn’t open till after I normally take my pills so it was maybe 3-4 hours late. I’m a Sunday start so on Monday I accidentally forgot my pills at home when I went to work and I took my pill probably about 12 hours late. That night I had sex no condom and he pulled out. I know for a fact though I took my pill on time the next day and each day after that. I got nervous though and took a plan b on Wednesday. I’ve been having bleeding/brown discharge and some cramping and I’m not sure if it was from the plan b or left over from my surgery. Should I be ok? My period is supposed to come next week. I’m just nervous 🥺