BFP and now cramping! ?

Shawna • A Mother, Wife, Sister, Daughter and Friend... We wear many hats.
Last night I got a BFP and myself & my SO had sex... Afterwards I had a little cramping but it went away. I woke up this morning with mild cramping that has been off and on all day so I took another PT to make sure and it came back positive again but I am still cramping a little! (No bleeding by the way) my period is due in 4 days but just curious is this is common? Am I getting false positives? I didn't experience this during my first pregnancy. Please Help!!!!