Hello everyone

Me and my husband made a decision to have a baby so I had my iud removed January 15,2018 and started tracking my period and ovulation dates. But with 4 year old twins and a busy life I have not been really paying close attention to my ovulation. Just tracking when my period start will. I was suppose to starts my period the past Sunday but didn’t as of today I’m 3 days late and I have cramps and tender breast !!! 😱 I decided to take a test this morning but it came up negative 👎🏾!!!😞 So I just suspect that I’m not pregnant and wait for my period or wait some more time to take a test and how long should I wait to do it again ?????