Symptoms?

Last night was hell for me! I had severe heart burn to the point where I felt like throwing up but just couldn’t. I thought I would just sleep on it, in which I did but nothing ever came up. I’ve been super tired lately and my body just feels extremely weak. Also some pains & aches on the sides of my breasts. Now, it might be too early to feel these symptoms but there is a big chance I could be pregnant since I’ve had unprotected sex all month. I just don’t know when I could have ovulated. I have a 29-31 day cycle. Any help is needed, thank you!