Young and unsure!

Hi all! I'm 19 years old me and my boyfriend of 4 almost 5 years have had unprotected sex a few times but we always pull out prior to finishing. In march we had unprotected sex on the 4th, 5th and 6th we pulled out every time prior to finishing, but we did have sex multiple times after another in one night. 
I have irregular periods sometimes and my last period ended on the 3rd of march but lasted 15 days. 
I haven't had any sickness or feeling sick, my breads haven't been sore and I haven't had any constipation. 
I just need some advice as to what the possibility is that I might be pregnant? 
Thanks in advanced! 

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