HELP..IMPLANTATION OR PERIOD?:,(

I had my last period start 22nd of March...I BD'd in my Ovulation week starting April 10th....4 days ago right after sex i had blood that was bright red that came out and leaked over my underwear not a tiny bit but a good amount...Monday the next morning i wome up to no blood on my pad atall but when i wiped there was a big clot of blood that was dark red... Mixed with red blood not a thing went on the pad...Throught out the day the blood went dark brown quickly still nothing on my pad then at night when i finished work 8:30 home for  9:30 it was light brown mucus...i started this around 10dpo bright red blood for was for a day only and by tuesday after the mucus that night/weds morning it was completely gone....I had massive cramps not anything severe but they were there only the day the red blood was there...and now gone I was not due until 26-27th this started 20th...was it a Misscarraige?...has anyone had this? Or similar?...I have no cramps anymore an i always do every day a week running to my period....i tried taking a test today and got a bfn..:,(....plz help ladies...xxxx