My boyfriend and i didn't have sex but i was on top of him with undies when he ejaculated.i am worried i might be pregnantiva had severe constipation?

Worried about preg.?: Any woman of childbearing age who has some nausea (with or without vomiting), some fatigue (feels less energetic), a sharper/stronger sense of smell, mild soreness/swelling of her breasts, and maybe some food aversions and cravings . . . Could be pregnant if she's had sex recently. Symptoms can occur before missing a period. A urine pregnancy test is accurate if done 3 weeks after having sex.