pregnant by IUI too many ultrasounds ?

Hi all ,
I'm currently 7 weeks pregnant as a result of <a href="">IUI</a>. I am still under the care of the fertility clinic. I had my first pregnancy ultrasound around week 4 , I had the second one for fetal heartbeat this Monday (October 3rd) they are asking me to come back tomorrow for another ultrasound and bloodtest. Then another ultrasound Monday the 10th. When I asked if there was a concern for the one they suddenly scheduled for tomorrow they said no. I am worried that if I do these next two I will be at 4 ultrasounds before my 8th week of pregnancy. Is this too many ultrasounds for the first trimester ?