Feeling worried

So found out Monday morning I am 5weeks pregnant. I am not getting any symptoms atm and was wondering if this has happened with anyone else? This is my 5th pregnancy by now my boobs have swollen, feeling super tired and feel sick best part of the day. But nothing atm unless I am early then 5weeks :( I am so scared history is gonna repeat it's self. Had a missed miscarriage then fell pregnant and had my first boy then had a miscarriage and then fell pregnant and had my second boy.