Please tell me, could I get pregnant or get std's if you wear a condom?

Yes, it is possible. Depending on proper use of condoms and sexual practices. Condoms do not guarantee 100% protection.
Condom. AGree w Dr. Tavarez. If a condom is used consistently and correctly the efficacy rate for preventing pregnancy can be up to 98%. With real time use it is usually less. It is also not 100% for STD's.