Help: 22 month old super clingy

ctgrl

I know I'm a little early to be on this board but I am hoping that someone here has gone through this and can provide some advice.  DD is 22 months and used to go to bed amazingly well. she used to just climb into bed we would read a few stories and I left.  She has been in a toddler bed for about 6 months.  I am 32 weeks pregnant, and am not sure if she can "sense" something is different.  But the past couple of weeks she has been super clingy to me and nap/bedtime has become a nightmare.  She will not let me leave the room.  Even if I stay in the room until she has fallen asleep when I leave it is like she knows and instantly has a crying screaming fest until I come back.  I'm at my wits end.  Any advice?