Has this happened to anyone before

This is probably too much info, but  recently with intimate with my husband, and I started to bleed( a good amount but not super heavy) and thought oh my period came early  and I get very super heavy periods so I was like oh OK. Let me go put a pad on before i go to bed this was on Tuesday ….  so far no blood at all only when we had sex. Now i just been brown spotting since Tuesday Not on the pad just the paper but nothing on the pad , feels like my period just no cramps. I’m supposed to get my period on the 28th-29th

Has this ever happen to anyone before ? Maybe it’s just early or maybe it will full blown come next week or this weekend. But i feel so tired , sore breast and just totally out of it.  I always bought a few days before my period but never a full week. Also during sex it was real blood not spotting.