Hi, Thanks for using HCM.
Delay in period is not a know side effect of trimethprim.
You can get blood HCG
test done which is more precise than UPT.
Need not have to worry, your periods could be delayed due to stress
, as you had infection.
Rule out pregnancy
first, then you can take progesterone
preparation for 5 days, on stopping medication it causes bleeding as withdrawal bleeding.
Consult your doctor for examination and management.
Hope I answered your question. Feel free to ask me if you have any further queries.
Wish you good health. Take