My baby is 16 weeks old. We had unprotected sex yesterday..please let me know whether i will get pregnant..?

The only way to reduce the possibility of getting pregnant is to not have sex or get on birth control. Unprotected sex always has a chance of resulting in pregnancy. Even protected sex can result in pregnancy. Wait a couple of weeks and take a test. And in the meantime, no more unprotected sex. If you're not on birth control, use condoms, though abstinence is the only surefire way to prevent pregnancy. Good luck.