5 weeks pregnant 3 months after miscarrage

hi all i recently had a miscarrage in october witch broke my heart myself and my husband decided to try again im currently 5 weeks and 3 days pregnant and thismorning i had a bit of brown blood and period like cramps through out the day its been small amounts of brown stuff has anyone ever experianced this as i already have a little boy and never had this while i was pregnant on him. im terrified this will happen all over again any advise will be a help. thanks a mill