(TMI) So I'm 6 1/2 months postpartum. I've been getting my period since 2 months PP. In July I had an irregular period…

(TMI) So I'm 6 1/2 months postpartum. I've been getting my period since 2 months PP. In July I had an irregular period and August and September I've completely missed. I've been having pelvic and back pain and a lot of nausea, also sensitivity to smell/scratchy throat feeling. Could it just be something postpartum or another pregnancy?