I’m losttt

I had my period on April 15 - April 19 on the 20th I had sex but ended up still being on my period which officially ended on April 21st then on the 22nd I took a plan b (levonorgestrel 1.5mg) for precautionary measures. And literally one week later on April 28 I started with a heavy flow and all till current days (4/30). Do you think the plan b effected my period cycle or it’s possible I’m implantation bleeding