IUI and Lazy Beta

IUI was done on Sept 25th and 26th. On Monday, Oct 9th a blood work was ran, I am pregnant. Wednesday's blood work went well, 50 Beta... yesterday's blood work came back 75 Beta. It was supposed to be a 100+ .... They are going to perform another blood test on Monday, but I am sure this pregnancy is not viable. Same scenario happened last December. This will be my 4th pregnancy this year. My husband wants to move to IVF (he is a problem solver)... meanwhile I cannot stop crying.

Anyone has had a lazy Beta? The levels picked up later... and had a healthy pregnancy?