hi Doctor are you really there?

I have been trying to conceive for two years. I have regular cycle- 28 days , and i have 3 to 4 days of period. i have some fibroids which my doctor told me are still small and not a cause for infertility... my husband tests were ok. I have done 3 cycles with chlomid .. and one failed IUI. twice I have felt all the signs of pregnancy only to get my period after being a day or two late. This month my period was one day late but before it came , I had spotting for like 5 days, nausea, restlessness and tender breasts... but the period came it was very dark in colour for the first few hours.... and after it became the normal red. Could I have conceived and failed to implant? what can i do to increase my chances of pregnancy