Chemical pregnancies??

Has anyone experienced multiple chemical pregnancies? I have now had 2 in the past 4 months. My husband and I have been trying to conceive our 2nd child for the last year. I have recently started clomid. I tried 50mg in November and did not ovulate then December was on 100mg and ovulated according to my progesterone levels.

Anyways if anyone has had multiple chemicals did your doctor do any testing to find out if there is anything causing them not to implant fully?

Thanks!