Can sex change your period cycle??

Helen
I had (protected, consensual safe*) sex (we're both 20+) for the first time on Sunday & again on Monday.
Iwas just wondering if it would change anything regarding my period.
We had sex close to my period due date & I bled a lot on Sunday.
The first was when we were done & saw that I bled when he was trying to get it in, so I just assumed it was because it was my first time.
The second time I bled was while we were just sleeping on the bed. 
I ran to the shower & that's when a bunch of blood started coming out & I thought that was my period.
Fast forward to today, Thursday, no blood.
So I don't think that was my period.
My question is just if it changes anything like when it comes, how long it lasts, if my heavy flow will become less heavy...? 
Things like that.