Should i repeat abnormal tsh results after i stop breastfeeding? tsh was 0.01 while t3and free t4 were normal. pcp said breastfeeding could be the cause?

Good idea. It would be useful to repeat TSH and free T4 a couple of months after stopping breastfeeding, unless you have symptoms. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV and Covid vaccines. Wish you good health!