TTC-TMI

My fiancée and I have decided to start ttc. We started a little over a week ago but I have been O for last 5 days today is my most fertile day. We have been having sex every since my cycle went off on Sunday 8/22(skipped 2 days). I have been cramping alot but the weird thing is I've all of a sudden I became very bloated and constipated also the bone in my bottom (coccyx) hurt, has this ever happened to any of you? BTW this is new to me, any and all advice is welcome 😊