hysterosalpingogram

Lyndsey
I am 32 and had an ectopic at 5 weeks in December and before that I had a miscarriage in July.   I went in for a 10 week ultrasound and there was no heartbeat.   My Dr now wants to do this dye test if start my period in 10 days.    Any advice or input on this?   I haven't had a problem actually conceiving, it's just actually carrying the baby.   
Any words of wisdom or anything I should expect?