Needing opinions and advice

Venus • Owner of Rosemary & Thyme Blog 🍨// Baby #1 born at 35 weeks🌻
My hubby and I just started talking about having a baby a few days ago. We decided that we won't use birth control and if it happens, it happens. 
Last night I was super nauseas. For the past few days I've been super fatigued and overall gross feeling. Just don't feel like myself. My muscles have been super sore. I've been sad/depressed. I don't have any motivation. 
Today I woke up with bad lower back pain and have been extremely nauseas all day with on and off bad stomach pain but there's a constant dull achy feeling in my belly. I can barely move without feeling like I'm gonna throw up. I still have lower back pain but it's not as bad. 
I didn't think pregnancy was a possibility right now because I had a 4 day period only 4 or 5 days ago. It was much lighter than normal but I still bled. I've been reading about bleeding while pregnant. My aunt had normal periods throughout a few of her pregnancies and many many other ladies have as well. 
So I guess my questions are: have you ever bled while pregnant? Did you have stomach pain while newly pregnant? What helped your nausea? 
Thanks!!