If you'd caught anything from raw chicken, you'd have much more than a tummy ache. You're probably just nervous about it and it's giving you symptoms. Honestly, don't worry about it! Yes, it's safest to stay away from raw or undercooked chicken but that doesn't mean any contact with raw chicken will make you ill. Chances are the chicken was completely fine so wouldn't harm you, even if your partner didn't wash up properly.
There are many things to be careful of in pregnancy but there's no need to be scared really. Overall, the chances of anything happening are very low, even if you didn't take precautions. Of course we still do, to be as safe as possible but "breaking the rules" once or twice isn't likely to harm you or baby.