tightness in lower right side of stomach

i’ve had brown discharge for weeks now and i had my period (i think since it was bright red with dark brown and i was in super bad pain) but it only lasted for 2 days heavy and 2 days light. also tmi but i had diarrhea bc i took a laxative and it caused me to have bright red blood like my period when i wiped but my period wasn’t supposed to be over yet so it kinda makes sense. does anyone know what may be causing me to feel a tight place in my stomach on the lower right side? i had it when i woke up this morning and when i bath it feels like pressure on my lower stomach.