Beta levels

I went for blood work this morning and my beta levels are only 283. I'm going back next week to get them checked again and really crossing my fingers they rise. The midwife thinks I'm 5 1/2 weeks pregnant but I have long cycles and know when I ovulated so I don't even think I'm even 5 weeks yet. I know there's no way I'm almost 6. Is 283 an okay number? It seems really low to me.