Plan b

I have a question hope someone can answer. I stop taking the mini pill due to complications. This was back in February. On March 2 me and my husband had sex. We used a condom but it got Stuck inside 🤦🏼‍♀️ I was going to the doctor that day to talk about my period. One of the reasons I stop the pill was because I haven't had a one in 3 month. She give me the plan B. A week later so the 10th I started to bleeding. I'm guessing period it was 4 days long. Now here I'm with no period again. Could I be pregnant? Did the plan b not work?