He didn't cum, but I am scared of the precum, I have some symptom and I am always hungry

so here it goes . my boyfriend and i had sex recently but he did not cum in me but we're still scared about me getting pregnant by his pre-ejecuarion . my breast starts to get abit bigger and heavier compared to before and my stomach feels hot on the inside . most of the time im always hungry eventhough i've eaten few minutes before . i dont know what to do now .