Miah & thumper? or mommy and dady?

i have to cute bunnys one is a havanna bunny her name is miah and i have a brittania petite my male bunny thumper theyve been together for 3 days now i have had miah for 3 moutnths and thunper for 3 days im not sure if miah is pregnant i think she is when i put her in there they started doing it a little i dont think thumper liked it (he was shy at first) now they are eating together drinking together sleeping together and playing together is she pregnant?(i do want babies i am prepared and i do know what to do i got formula and everything set up for the babies incase of the mom gives up on them the only thing i need to know is there any sighns of pregnancy?