Please I need support ladies 😞

Nancy
First thing is : that I'm upset because  I'm not longer breastfeding my 8 weeks old baby ): because I have an infection in my  tooth ): and I'm in treatment, now I'm giving my baby similac formula . 
The second thing is : that i fell I'm pregnant 😞 hope not . after 40 days of  giving  birth , I had sex whit my husband   2 times,(3 weeks ago)  ( unprotected sex) and he pulled out, didn't finish  inside  me ,this morning I woke up whit some headache and nauseas 😷 maybe I'm going crazy): I can not imagine myself pregnant right now): my boy is only 8 weeks old 😩 im so afraid of doing a pregnancy test.  My husband says that I'm crazy , we don't want a 3rd child ): please ladies any of you whit similar story?? Or maybe knows what is the change of being pregnant??Â