Has this ever happened to you

1 day super dark brown disharge and then it stops and the day 2 bleeding with some cots but kind of light then it stops and then day 3 really really light (dark brown) discharge. Now when I get my period it's a little bit of brown discharge then blood for 4 sometimes 5 Days but never heavy. This is the first time it's ever happened to me like this. So I'm a little lost. Tho we did have sex during ovulation but I don't feel prego or anything.