uterus changes in early pregnancy??

Ch
When you all first got pregnant, could you feel the tendons and uterus shifting?
 I remember when I was pregnant with my daughter, I spotted one night and 3-5 days later I could feel that weird stuff happening inside. Like the tendons stretching I'm assuming, basically stuff just not feeling normal. I took a test that day and found out I was 4w2d. 
But i was just shy of 120 lbs when I got pregnant. Now my daughters six months and lm a little over 140. I'm having all the symptoms of pregnancy besides those twinge feelings in my abdomen. That's the only thing stopping me from thinking I'm pregnant again. But I'm also 20-25 lbs heavier so maybe I won't feel it this time? 
I have the nexplanon but was extremely irresponsible when it came to sex while we were on vacation. A week or so later I spotted just for one night and haven't bled since. That was probably 10-14 days ago. Now I'm having every symptom, from bitchiness, crying, exhaustion, can smell things better, boobs are heavy, digestive system is all whacked out, slight nausea, etc. but I never had those feelings in my abdomen.... 
What do you guys think? 😭