Dizziness, producing a lot of saliva, fatigue are early signs of pregnancy which I have been experiencing but what about slurred speech?

Seek help ASAP. Any time there could be neurological issues such as slurred speech, you don't want to assume it is from pregnancy. Seek medical help immediately as it could be a sign of serious underlying problems.
Seek help. The symptoms you report are not indicative of pregnancy. Important for both you and your child that you bee seen ASAP. Take a written list of all symptoms and all Meds with you.