I had my period on June 18th and I had intercourse on 24th and 26th June , will I get pregnant ?

There is no way we could know if you could get pregnant from that encounter. Anytime you have intercourse pregnancy is a possibility.

Did the guy wear a condom? Remember, even if he did it still might not work, trust me I know.

We have cases where a person was practices three discrete forms of birthcontrol and still managed to get pregnant. There is no absolute, especially biologically speaking, and doubly so when you're talking about procreation.

I had my period on June 18th and I had intercourse on 24th and 26th June , will I get pregnant ?

If you tend to ovulate early in your cycle, you could have become pregnant. See what happens when you'd expect your next period.