Please suggest me pregnant care for my dog?

hey pls help!!! Actually my dog is 40 days pregnant. Its her first pregnancy she had not been mated for first two heat. I want to know if she knows she is pregnant or is she is confused with all what is happening to her. My male dog who is little hyper active is playing alot with her is it okay i am always worried if he hurts her i tryed to chain my male dog but my female dam goes to him and be with him . . She was once trapped in the chain . If i lock my male dog in a room my female dam will be barking 24x7 and if i lock her she will again be barking . . I dont know what should i do. Pls also suggest me on pregnant care for my dog. Thanking you all in advance