cramps since period, chance??

hi all,

i have been still getting cramps since my period finished (which was brought on by the 10 days of taking primolut N as i have VERY irregular periods), then on day 2-6 i took clomiphene and day 10 of my cycle did the folicle tracking ultrasound, was only quickly told there was a few there but only one which was the correct size, from about day 13 iv had all symptoms of ovulating just no positive opk but lines did start get darker so hoping i just didnt take test at right time, but have had sex everyday since day 12, i keep getting cramps and was wondering on what anyones ideas on why i am getting these still and what do yous think are the chances that hopfully iv fallen?