Just need a little reassurance!

Sara

So my OB is on vacation until the 11th which is when my next appointment is. I'm currently 20 weeks 4 days. I have been having pretty bad back pain for the last 36 hours and some pulling and cramping sensations on my far left and right side, right beside my hips, that almost feels bruised today. There is no rhyme or reason to the cramping its very random and sporadic but its still making me nervous. I also every now and then get a weird ache in my vagina that lasts maybe 5 seconds and then goes away. I'm a FTM so everything makes me nervous. I feel like I may be getting bigger and maybe thats what the pain is but I'm still worrying like crazy. Please tell me this is all normal!