Rash? Bite?

Woke up today and through out the day, had some pelvic cramps.. cool. I lifted my shirt to show my husband underneath of my stomach where the pain was and noticed these bumps. They dont itch but are now a little sore.

My mom said possibly spider bites, but I read that spiders usually only bite once.. now I'm starting to panic. My husband and kids have no bites and theres nothing on our bed so I'm pretty sure it's not bed bugs.

Any ideas on what it could be? & sorry, please ignore my stretch Mark's, courtesy of my daughter