Period LATE


So lately my period has been late last time was during June I was late cause I took a plan b and threw off my cycle and it came during the end of June (lasted for about a week ) now I’m late again and I’ve taken about three pregnancy test and all have been negative (I’ve been really active with my bf) but I know for sure I’m not pregnant 😂they have all been quickies

But I’m not sure if it’s normal 🥺It’s been about 5 weeks since my last period

If you have any advice please comment down below <3