Thanks for the query.
Ovulation kits actually measures elevataed levels of LH. After that usually in around 24 to 48 hours the ovum will release. And if you had unprotected intercourse
around this period then there is possibility for pregnancy
But as all your ovulation kits showed positive results, there is possibility of hormonal
And there is possibility of condition called lutenised unruptured follicle.
So once consult gynecologist and get evaluated regarding these.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429