hi, I understand your concern. An unprotected sex 1 week ago- even if causing conception can not cause bloating /cramps so early. I feel it s a sign of pelvic inflammation/ vaginal infection- May be -previously existing infection had exacerbation after sex/recently caught sexually transmitted disease. - I would advise for internal examination by a gynecologist and start with specific treatment for your complaint. -Even precum has sperms which can impregnate a woman. So treatment of infection is important from possible pregnancy point of view too. The pregnancy can be detected by blood HCG testing after about 3 weeks of sex. Thanks.