What's wronge with me?

I need help. I am 30 years old, and I 'm married for over 2 years. I didn't use birth control or nothing alike, but still I can't stay pregnant for some reason. I have my period on 28 days, and few days after a period I am extremely horny and I can have sex all day and all night long. I was always sexually healthy person with high libido, although my husband doesn't share my 'enthusiasm' ;). I had two abortions when I was in my early twenties (first time I was 19, sec time I was 22 without any complications) and since then nothing. I was at doctors, but I am healthy and they say everything is in perfect shape, but still nothing. And why am I so horny after my period? It's extreme feeling, I can have orgasm just by siting on chair, just with one kiss, and not to mention how much my nipples are sensitive. I am having multiply orgasm usually, when I'm not this horny, but you can imagine how it is after my period for a week or two. My poor husband is trying to catch up, but he have a bit of problem with early ejaculation I think, because our sex is usually 1-2-3 min long. Do you suggest me to do some tests? Is it normal to have such a strong desire? I started to notice this strong desire in last few years (after my periods), and I was ashamed to ask my gynecologist about it, because first time I went to him, he thought that there were to many secretion down and he run some tests, but it was all fine. The truth was that I was there after my period, so you can imagine how embarrassing it was to me to get orgasm during the routine check at gynecologist. And he was totally professional and so not my type of man. So I couldn't ask him about my 'problem' if I can call it like that. I really need advice what test to run for fertility and off course what to do with my horny days in month.