11 days late?? 4 months post pardum

Kimberly
Hello everyone ! I have a quick question, I have a 4 month old daughter and i pumped for the first month since she was premature (32weeker) but after a month i stopped, i got my first period at 7 weeks pp (march 30th) then again on april 30th , but its already june 11th and I havent recieved my period yet? I took 2 pregnancy test but that said negative a few days ago, should I test again? Anyone else have to wait a long time to get a postive? With my first i was 12 dpo , (also this pregnancy wasnt planned if it is postive) but will love it none the less ❤️ any advice ?