My 20mth old's sleeping routine?

My 20mth old little girl has always been in a great sleeping routine and has always went to bed at 8:30/9pm EVERY night and slept right through til 8/9am she often has a 1 hour nap during the day. Recently, in the last 2wks or more she has started resenting bedtime and even cries on the way upstairs! I have tried stopping naptime but she still resists going to bed. She has also now started wakening between 3 and 5am EVERY night and i cannot get her settled. She will scream and kick her legs and have a tantrum every night around this time. She refuses to take a pacifier and throws a bottle out of the bed. She sleeps in her own bed and room the last 6+mths. Last night she woke screaming at 1:30am i went into her and tried to settle her but she wasn't having any of it so in the end i had to let her cry it out. Im not a fan of this technique but there was nothing else i could do. She did eventually fall back to sleep after about 5mins but she woke again at 5am screaming like a mad woman LOL NOTHING i could do at this point would settle her and letting her cry for more than 10mins im not willing to do so i lifted her into my bed and she fell straight to sleep til 9am. ive only EVER brought her into our bed 3 times and last night was the 3rd so i knw she wasnt expecting this. Anyone else having or had the same problem. Pls give me suggestions on how to get her back on track! im 6mths pregnant with my second baby and my hubby works nightshifts so this is starting to take it outta me :( Pls remember that nothing has changed to her routine, nothing has happened out of the ordinary and this all just starting happening before i had the chance to stop it!