Tylenol pm

It says Tylenol pm is safe for pregnant women and so my husband bought one bottle last night.  I opted not to take 1 coz I was afraid that it might hurt my baby, but then, I just tried one tab.  But it didn’t help me coz it’s just one. I was not having enough sleep again.  So, tonight, I will try at least 2 and I will see if I will have enough sleep in preparation for my baby girl to be out.  Hope this Tylenol pm is just fine as what most reviews stated that it is category B and it has been tested that this is safe for pregnant people.