Sex during cycle make it shorter?

Logyn • I'm Logyn. Manage a Doctors Office and work for an Urgent Care on my days off. In love with the man who completes me
Here's the deal :
I've had my period for 11 years. Always lasted 7-10 days, every two-three weeks. However, this time, it lasted three days. Now, I was brave, as was my boyfriend, to get intimate in the second day (no pullout). The fourth day, I had no period. Same for the fifth. Thought it was the usual one day off. We had sex again the fourth and fifth days (no pullout). But, I haven't had anything. Is is because of the sex? 

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