Getting period late and pregnant

Katrina • Been trying to have a family for about 12 years now. I have had 3 miscarriages doctors still dont know why.
Can you be 4 days late for your period and be pregnant..... I took a hpt it was negative..... But I've had 3 miscarriages in the past and hpts don't show...have pregnancy symptoms.... Just curious if anyone else has had this happen.