A little Nervous...please advise

Asia

I'm in the same about 5 weeks 1 day a little cramping and yesterday I had light pink very light when I wiped myself around 1 then at about 4 same thing about 7 it was pinkish brown all when I wiped myself never enough to fill pad. I had sex last night 😑 I probably should not have and this morning when I wiped it was bright red but not alot just when I wiped now nothing and just a little lower back pain. anybody know why? this is my 3rd pregnancy but I didn't experience any symptoms then as I was only 17 and 19 now 28 with 3rd pregnancy....Help Please