cramps?!?

hey I am new on here and I was just wanting some advice....so me and my partner are trying for our 3rd baby and since the day of my last period we have been at it morning and night for the past 7 days and last night and today I have had little cramps like a period cramp could anyone tell me what this could be please? ......this 1 will be the 1s baby that we have planned my other 2 beautiful boys were big surprises my fist I didn't find out till I was 10 weeks and my 2nd I was a massive 19 weeks when I found out so I didn't really take much notice in cramps and periods as I had the implant both times and fell pregnant...