breastfeeding can cause contractions. but some can continue to safely breastfeed during pregnancy. best to consult your ob if you cam continue to breastfeed while pregnant
if okay with your ob, i think there's no need to worry.
hope this helps
https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/expert-answers/breastfeeding-while-pregnant/faq-20057803#:~:text=Generally%2C%20it's%20safe%20to%20continue,can%20trigger%20mild%20uterine%20contractions.
Tanie Binuya