Looking for reassurance

I’m 18 weeks and last night I had some belly cramping no bleeding or anything. Then this morning I had a family emergency arise and got a little stressed out and I had some tight lower abdominal cramping as well today. I had my cervix checked last week and it was perfectly long my doctor said so I know that’s not the issue and I heard baby’s heartbeat on a Doppler this week as well at my doctors office. Just a little concerned about the pains and if me being stressed/upset this morning could do anything. Thanks in advance