Stress causing Period?

Julie

So I take Mylan birth control to help with my period. Taking the birth control is supposed to cause my period to come every three months. However, I’m in college and finals are coming up, so I have been under a lot of stress. My period came this month even though it came last month. My symptoms aren’t too bad, just bloated, and cramps and my period has been heavy. Is this normal thing to happen?