High TSH and low Vitamin D....

So I went to my PCM and they told me that I have high TSH but not too high or high enough to have hypothyroidism, but she prescribed me 25 mcg of synthroid (or something like that) and I also have low Vitamin D but not super low either. Has anyone had this and had any symptoms. I asked her if it could cause weight gain but she never responded lol and we have been trying to conceive for quiet sometime (the reason she did the check up). Just tying to here some stories and if the medication helped with fertility or your symptoms... thanks 😁