I had sex with my boyfriend with condom but he...

Can pregnancy happen in your condition ?
Yes if there was a break in the condom during intercourse and sperms leakage to the vagina pregnancy can occur 
What are the sign and symptoms of Pregnancy ?
There are many signs and symptoms which can increase your suspicion of pregnancy , and these include :

• Delayed period .
• Nausea and vomiting .
• Abdominal and low back pain .
• Breast pain .
• Changes in appetite .
• Positive pregnancy tests .

When can you perform pregnancy tests ?
You can confirm pergnancy by doing pregnancy tests ( After your expected period date ) and the tests include :
Urine pregnancy test if your period was delayed .
Blood Hcg level .
What to do at the moment ?
 you need to wait until your expected period date to perform the tests .