Pain after masterbating

Hi my so has been away for 2 months. So masterbating has become the next best thing. But the last 2 to 3 weeks maybe more after having a Lil play I feel a Lil dull ach around the adermin. (I play with vibration toys) I am also 2/3 weeks late (I'm not pregnant as had a period since he has been away) this in not the first time I have been a week or more late. I just don't understand why I get a dull ache after having a play or why I keep being late doctors want check me out or less I'm over 6 weeks late Please help with some advice thank you x (p.s also wanting to try for a baby when so gets home in 2 weeks)