My boyfriend and i had sex twice yesterday. And usually we mess around a little before he outs a condom on. I always worry about precum getting in me. He usually doesn't go all the way in me when we mess around but i know he sticks it in. We use a sperimicide condom after and he swears he didn't do anything inside me but he thinks i should take plan b in case. He knows i worry and have anxiety til the point where it makes me sick. Anyways..Will it be effective at this point if anything did happen?