Period?

Hi guys today I’m supposed to get my period, some days I get it later in the day or in the morning. They last few months I’ve been getting it in the morning. This morning I wiped and it was a brownish color and I wiped again and nothing was there. Still no signs of a period but im cramping. Is this just my period coming or could this be pregnancy? I only had sex once this month and it was during my period cycle last month. Plz let me know I’m kinda worried.