Why do I feel worse after starting Zoloft?

B

I just started Zoloft three days ago for postpartum anxiety and depression. I feel like my anxiety and depression has gotten so much worse since starting. Not to mention a pounding headache non stop throughout the day. I know it takes 4-6 weeks to start feeling the effects of the medication but I’m scared it won’t work fast enough and I will get worse and worse. What are your experiences with Zoloft?