My Last Period Was April 20th To The 23rd And

My last period was April 20th to the 23rd and I had sex May 1st, 4th, 6th, 8th and 9th my next peeiod is suppose to come May 20th but lately this past week I've been experiencing tender breasts where my nipples are mostly, some acid reflux and very tired and thirsty and hungry a lot and now I'm having sensitivity to smell usually I love the smell of mens body wash, but yesterday when I tryed to smell some mens body washes it made me feel sick like i wanted to throw up. Could i be pregnant? Are these early sings?