Hi, Thanks for using HCM.
Get done one USG abdomen and pelvis and blood HCG
levels to diagnose the cause for your symptoms(pregnancy
or other cause). Get speculum examination also once to rule out any obstruction for bleeding or any problem in vagina and adnexa. Low back pain
may be due to muscle stretching pain.
Consult your doctor(gynaecologist) now for further examination and management.
Hope I answered your question. Feel free to ask me if you have any further queries.
Wish you good health. Take care.