I'm 15+2 with my third baby. Have been getting cramping on and off right since the start, but since yesterday morning it's been worse than before. Feels like pressure too like I need bowel movement (but I'm not constipated and haven't been). It's not a UTI cause I've had them before in pregnancy and doesn't feel like that at all. It's like bad period pains with pressure.
Changing position etc, resting, not helping.
Tbh I'm really scared it's the start of a late miscarriage or cervix opening or something. Need a handhold, feel so alone 

. My older children are at work or out and partner doesn't seem to care, since it's his one day off work and is out with our teenage son.
Don't know what to do for the best. Was trying to ignore it hoping it was mild like the previous cramping I've had but I think it's worse. Have booked a private cervix length scan for tomorrow 11am. Looked at the maternity numbers I've been given and it's only a 24 hour service for 16+ weeks, below that and it's Mon-Fri 9-5. Would 111 out of hours be able to do anything? (I'm in Scotland), or should I phone the 16+ weeks line and ask for advice?