Should I be concerned?

Anna
A year ago I weighed about 143, I cut out chips and candy and junk food and everything.
In August after I miscarried I weighed 134, then it held steady till feb 26th when my Dr confirmed pregnancy and did my pap I dropped to 130. For the last 4 days I've weighed myself and I've been holding steady at 128.
Should I be really concerned with the weight dropping? I didn't experience this with my son because I threw up the whole time with him haha and I went from 115 to 160 and I have no idea how. But since I'm dropping should I be concerned? I'm being refered to an OBGYN soon so it's easier so should I watch my weight and monitor it and then ask when I see an OBGYN? It should be soon I think.