Very concerned

I'm very concerned. Last night my boyfriend and I had sex with a condom on. He took the condom out after he came and I saw cum in the condom. He didn't tie it or anything and just threw it in the trash. An hour later after he left I was about to take out the trash when I noticed there was no longer any cum in the condom. Afterwards I tried a water test and no water came out so the condom didn't have a hole in it or anything. I'm just so confused?? Could the cum have fallen out in the trash??