Post FET, BFP last week but...

[Starsandsunbeams]

Hi,

so we got a BFP last week after our FET hoorah! But since then, I cannot relax and am constantly thinking about it all. There was a faint positive on the Tuesday (12dp5dt), then I tested Weds, Thurs and Friday, all with good positives. Thursday and Friday I had mild cramping. Saturday night I had lower back ache and then Sunday morning I felt nauseous. Today I feel pretty normal. I am so worried about what is going on with my body and concerned that now I have no symptoms, something bad has happened. Never been pregnant before, first BFP and no idea what's normal/not normal. I am also on cyclogest and Lubion injections. Would these prevent any bleeding if I was to miscarry?

Any advice, very welcome xx