Trying to conceive ! Help?

I had unprotected sex may 6th, had sex may 23rd protected, had sex June 23rd half way protected. Now I had my last period the day after the may 6th sex, and it was a very long period! And just started spotting June 26th, then bled just a little bit June 29th. And haven't bled any since. And I have heavy flows! Could I be pregnant? What are my chances? I know the obvious answer is to buy a test but I wanna get some advice first. Were trying to conceive! Thanks!