Plan b fail?

Hello ladies,

I was wondering to see what you guys think.

I had my period July 11-17. On July 21 (day 11 from my first day of my cycle )me and my husband got intimate that night and unfortunately the condom broke. He pulled out, on time and I kinda know this since it was everywhere… (tmi sorry). But I didn’t want to risk it so I took plan b about 12ish hours later the next morning. On July 25 (day 15 of my cycle) i ended up bleeding and having a heavy flow for 3-4 days. I figured it was side effect from pill and my cycle started all over again. But now 2 weeks since I started the new cycle I’ve been feeling nauseous and kinda constipated for the last 3 days and I’m wondering if the plan b failed. Should I test now? Since originally my next period should’ve been during this week but I ended up having a period 3 weeks earlier. I’m just wondering….

Thanks ladies 🤍