Could I be pregnant. Your experiences please.?

Boyfriend and I are trying to have a baby. He came inside me several times this month. I only have to signs and that is a great amount of thirst which ive never had before. i haven't been having salty foods either and i get random nausea at night but not sure if it's in my head or not. but only at night. Im getting slights headaches probably to needing to drink water. but i pretty much can have bottle after bottle of water and still not feel satisfied. My period is due in a couple of days. no signs of cramps or anything. Anyways im ranting lol. What were the first signs and what did you get and how early were they? Thanks a bunch!