What is happening?

I haven’t had sex for 1 month, then after that, one week later my period came, it was a heavy one, as always, So it was a real period, not spotting(it’s irregular so it came on time.. At 3 weeks and some days).

Right now it’s Been almost one month since i haven’t got my period, Even if i got Sore breasts for 6 days, still no period!!

Could i be pregnant even i haven’t had sex this month and if i got my period last month after i had sex? Or is it just all in my head?