I had sex on the second day of period is there chance of pregnency

If you are going to have sex you need to understand how pregnancy happens as well as how your body "works." This is a good site - Understanding Ovulation : American Pregnancy Association

There's a chance, but it is not the most likely time as most women will not ovulate early enough in a cycle for sex at that time to result in pregnancy. IF you happened to have an early ovulation, or ovulate outside your norm, then it would be possible.

Best to assume that there is no 100% safe time and always use protection. Keep in mind that even then, pregnancy will be a possibility... even if it may not be probable.

Yes it is possible