Hi Mrspositivity, First of all I would like to welcome you to MN, although I am sorry the circumstances under which you have posted. I am really sorry that you have had 2 miscarriages in such a short space of time. It is a very hard thing to go through and can be not just physically, but mentally draining too.
I want you know that nothing you did made this happen. You drinking coffee, stressing or walking past some sheep didn't cause this. Please don't blame yourself. I too have asked myself these same questions, but in the end, like you say they are irrational questions that just make you mad. Unfortunately many women like us can't find an answer for why this happens, and so it's just easier to blame yourself for things you might have done, and ultimately thats not fair.
On the NHS they start testing women after they have had 3 mc's in a row. If you asked your GP, you may be able to ask for some of the tests to see what might be going wrong. If they decline you the tests (the main one is the karyotyping and clotting tests), then you can get other tests done such as hormones, thyroid and vitamin blood tests done to see if you are lacking in anything. They cannot deny you these simple blood tests at your local surgery if you ask for them.
Unfortunately, even after 3 mc's or more, some women (like me) never find out what the underlying cause for the mc's is. Some women go for private treatment, and there are many who are getting themselves tested for NK cells.
In regards to your bleeding - every woman I have spoken to on here seems to have had a different experience. I would wait until a week, and if the cramping and clots are still persistent, then see your GP.
One thing I will say is, please don't give up. You need to be strong and have a clear mind to focus on getting yourself treatment if you may need it. In my eyes, two miscarriages in a row is not bad luck. There may be something wrong with you that is easily cured, for example, many women are diagnosed with a blood clotting disorder and take aspirin and heparin during their next pregnancy, and end up with a baby.
I hope you find the strength to get through this. This is a brilliant place to meet other women in the same situation as you. I have learnt so much here about tests, and even just talking to other women going through the same crap is healing, as they say "a problem shared is a problem halved"; I really do believe that.