Vaginal spasm 18 weeks pregnant

Corinne
Hi all, I have asked this question before but unfortunately no one responded. I keep getting what feels like vaginal spasms, or pretend contractions? They don't hurt and they are not strong, but can be a little shocking, I have googled this but have not read anything specific, has anyone else experienced this? I haven't even felt the baby move yet, as this is my first pregnancy. ANY ADVICE or similiar experiences would be extremely helpful