HELP! NEW MOM

I have been having problems getting my 6 week old to sleep 😓 she always fights her sleep . Today she woke up at 9 stayed awake until 11 and took a nap u until 12. Then she woke up and stayed awake until 2 and she only slept for 20 minutes !! And then stayed awake until 4 and took another 20 minute nap !! Then later on I took her to Walmart with me which is about 20 minutes away and she slept there and back . I’m not sure what is going on. If anyone could give me tips or suggestions please let me know ! ( I’m going to call her pediatrician in the morning )