Is this normal to have before a period ?

so ever since i had sex for the first time once in August, (haven’t done anything since) I feel like my periods have been weird. the following period was quite normal although it lasted longer n had lower back pain. then like two week later I wiped some blood and then went back to brown discharge for like 4 days and then got my actual period. now another two almost three weeks later beginning today I had brown discharge then I wiped and it was just tinted light red then back to the brown and then when I got out the shower I got this. But now that I went again I just have the same brown tint barley any. Is this normal !? According to eve I’m due this Saturday. Which also weird that I’m getting it twice in one month. I am currently on cycle day 22