Normal behavior???

My kitty Stitch is a weirdo right now she is a bengal cross and has always been on the strange side, but she got out three weeks ago now while I was away, and was in heat. So I am assuming she is pregnant, all she has done for the last three weeks is eat and sleep, which is unusual as she normaly is VERY hyper. This week tho she has been really weird about things, like the coffee maker when I made coffee yesterday she acted like it was a new noise and was defensive. she has reacted that way with everything this week. is this normal and how do I help her not be so spooked about stuff??

well I just checked her belly when she was sleeping.. and her nipples are pink so she is definatly pregnant