Zoloft week 4

Hi everyone. I have been on Paxil from age 5 to age 27. My husband and I are starting to try for a family. So I think a little under a year I have been on Zoloft. I started on 25 mg then my doctor upped me to 50 mg and now I’m currently taking 100 mg. I’ve only been on the 100mg for about 4 weeks. And now all of a sudden, my anxiety is heightened. I’m getting heart palpitations and on the verge of panic attacks every evening. Is this normal? Should I give it a little longer to set in? Thanks everyone!