Irregular period

Caitlyne • Bonus mom to 2💜💙 Bio mom to 1 💜
So I was usually pretty regular (first period at 10 years old, now 17) and I've usually had a 28 day cycle. Lately I've been getting my period early (2 weeks apart) 
Now this might be a stupid question but could my boyfriend finishing inside kickstart my period? I only started being irregular when he stopped pulling out. 
At first I thought it was because I took a couple of my birth control pills then stopped but this time I took one when I finished my period 2 weeks ago and that was it.