Desperately TTC

J
I'm almost 33 years old. My partner and I have had 2 miscarriages within the last year and a half, 12 and 10 weeks respectively. Both of which were concieved whilst I was on the contraceptive pill. Although I clearly wasn't taking it routinely. Previously to this I miscarried at 19 weeks 6 years ago. 
I've undergone many tests without any abnormalities. We have been trying again since October and are yet to conceive. 
My periods had always been sporadic but lately they are becoming more regular. However I've recently become prone to spotting between periods, and many times I expericence a light bleed during sex (noticing it afterwards). 
I'm so confused and worried and I know that you shouldn't become stressed when trying to conceive but it's the most natural thing in the world and you just expect it to happen, it's taken for granted that you will have a family but realise that it's not that easy. 
I have an appointment with my obstetrician in May, if we haven't concieved by that time I will be taking a course of clomid. 
Has anyone experienced the same and if so how did it work out for you?
It may be worth pointing out that I have previously been diagnosed with PCOS but this has never been taken seriously and my obstertrician does not see this as a priority as I don't seem to have had a problem with falling pregnant, the issue is retaining the pregnancy
Thank you in advance. 
J X