Freaking myself out at night

I'm 15w+0 today and for the last week I've been waking up with a pounding heart around 3am and start hearing noises like someone's in my house but when I wake my hubby up everything is normal.  I can't help but wonder if I am freaking myself out thinking there's paranormal stuff happening or what's going on. But I haven't been able to get back to sleep unless I turn the tv on. And I feel horrible waking my hubby up because he gets up at 4:30am for work!   Does anyone else have stuff like this happen??