hello, i went through your query, it is good you have knowledge about ovulation period. yes unprotected intercourse from 2 to 3 days before ovulation to one day after ovulation period increases chances of pregnancy. all the tests are necessary only after failing to concieve , after one year of regular sexual intercourse, after one year only it is considered as infertility and to be taken for further workup. your husband may need to reduce his weight.