Since you poked yourself with the needle, it is possible that you got some vaccine
injected into your system. You should consult your doctor immediately to report the matter, but since the vaccine contains attenuated organisms, not much harm will be done. You may follow up your pregnancy
with regular fetal monitoring and sonograms; since organ formation is mostly over by this stage, anomalies are a rare possibility. More than this, avoid getting into contact with sick pets as this could lead to infections as immunity is compromised in pregnancy. Take care.