Hello everyone. Week 21-22. First pregnancy. All sorts of thoughts com…

Hello everyone. Week 21-22. First pregnancy. All sorts of thoughts come into my head ? Shivers started at 19 weeks, now I feel them often and sometimes they're right down in my belly and like they're going into the vagina, I don't know how to explain it yet. Has this happened to you? Can the baby give this indication that he needs more air or something like that? My hemoglobin has always been low. Suddenly, there was a second ultrasound, they said everything is normal. Weight was 281 grams at 19 weeks.