Is this normal for 5 weeks pregnant

I'm very early I'm only 5 weeks. I have a 7 month old son. He was born via c section. This baby was a surprise. Well I'm having a hard time this morning. I'm so sore in my uterus. I feel like I'm going to pop and it's sore. It's not cramps but like I pulled a muscle. I also had some very faint pink discharge when I wiped. I never had this with my son but I also lost 2 before him. Please tell me this is normal. I wouldn't be able to take another lose.