It is difficult for you to judge the time of ovulation or if ovulation occurs at all, when you have such irregular periods
. So, even if you have conceived your HPT may not have shown positive result as you did it too early. I advice you to take a blood test
and ask your doctor for a sonogram since you are only 5 months post-operative and regular ovulation is not yet established. Get a complete urine analysis and stool test
also to rule out infection. Please consult your doctor for further information. Good luck.