Trying to concieve

Hello to all! I been trying to concieve for the last 3 months with no luck. I need help...

I have been using ovulation calculators but they all giving me different dates. I also bought a 7day equate ovulation kit from Walmart and have been using one every morning for the last 4days. *Don't recommend that brand* Nothing has showed up.

I had a 7day period June 2-8. I had sex on june 26 and 30 and July 6.

I had a 7day period on july 8 -14. Had sex again July 24 and July 26.

Can someone help me figure out when is my ovulation for July PLEASE!