Pregnancy symptoms but haven't had sex?? 5 weeks pp

Ash • Married 8.2.2014. 1st Boy 11.24.16. 2nd Boy 8.27.18

Since last night, I've had the the following:

Fatigue

Headache

Nausea

Vomiting

Sore breasts- painful to touch, constant pain and burning (I am breastfeeding, they hurt so bad I can barely hold my son) this is the worst symptom. It hurts to take a whole breath. My son is eating every 2 hours so I'm not sure why they hurt so bad. No lumps or redness.

I haven't had sex, I did have some bleeding(period like) but that was last week and it was only for a few days. We are both being treated for thrush. We've had that for 3 weeks though. I really don't know.