3rd loss in 6 months

I've 3 children from previous relationship so now happily married to someone else.

I had marina coil taken out in July last year & started ttc which took us 4 months for our bfp which was the beginning of November but sadly had a m/c in December at 9 weeks (blighted ovum).

Took me 3 1/2 monhs to have af then started ttc again, got a very faint positive & af showed up on cd 34, then this month its happened again with the faint positive & af's showed up again.

It doesn't make sense to me at all why i'm having chemical pregnances all of sudden since the m/c in December which was my first loss.

I'm just hoping we'll be offered tests now to try & fnd out what's going on