What Is Causing My Acidity With Urge To Vomit During Periods?

Before I fell pregnant with my first child, I always had the same pre menstrual symptoms - dizziness, bad stomach cramps. After the birth of my first child, these symptoms disappeared. However, 2 months ago I noticed a change in my symptoms - acidity with the slight urge to throw up. I am still bleeding as per normal periods but could I be pregnant? I am 33 years old and 153cms tall 55kgs