Help.

I know you ladies aren’t doctors but I’m looking for a similar experience. I’ve been in bed for a couple of days due to being so sick. Well I rode to the store with my boyfriend last night and after walking for a minute I started getting cramping in my lower abdomen (where you normally would get period cramps) and they would radiate down to my vagina. Is this normal? It stopped after I sat down. I will be giving my doctor a call when the office opens. I’m also 16 weeks!