blueprint4dysfunctional_Phoenix

I am recently married and my husband and I have taken the whatever happens happens road so we haven't been being careful. My last cycle started on the 25th of May and ended on the 29th of May which is totally normal for my cycle. I have taken four positive home pregnancy tests within the last 7 days and even went to the doctor's office to confirm it. The test didn't even take a minute before it started to show that it was positive. Here's my problem. My sister told me that the baby probably hasn't even implanted yet and that because I found out early on I am going to be heartbroken when I start my period. I am going on three whole days late but am still scared to death that I'll be coming on any second. I did still go out and buy prenatals and I'm making an appt. with an OBGYN soon. But can anyone tell me when you know when its implanted or when a chemical pregnancy is most likely to occur? Thank you so much for your help in advance.