You've had a right-sided ectopic pregnancy before, with that tube removed. Because of this, a positive test now needs a proper blood test and scan soon, not just routine confirmation.
Next Steps
Please see a gynaecologist quickly for a
beta hCG and an early scan, regardless of anything else going on around this pregnancy.
Health Tips
The question about paternity and what to tell your husband is a personal decision, not something a Q&A answer can guide. Please make that call yourself, based on what feels right for you.