I think the chasing is part of the courtship and my females rarely attack a male when in season, normally any male can be put with a female at that time.
There is a chance she may continue to call tomorrow aswell. Some females go into the next day. Not every mating will be successful, it may be one mating was enough. You will know in about 14 days. If the mating is not successful the female will have come into heat again. It will be safe to introduce Alfie back in on monday, the female may change behaviour, these are some signs of pregnancy:
1. Aggression towards the male, not letting him near, chasing him away from her, chasing him away from nesting area
2. Eating cuttlefish
3. Nestbuilding, adding extra bedding to nest. Stealing bedding from male.
4. Teats appearing through belly fur.
5. Scratching her belly
With Abigail and Hermione it wasn't until the third week that the teats became very noticable and it was also then that i noticed a small increase in size. Same with Hermione, no size increase until third week. It wasn't until the final week that they got the largest and also the teats became very noticable. The belly does become pink as the fur thins.
My first clue though both girls were pregnant was they didn't call again after mating with the boys.
Heres some pics:
In the first Abigail you can just see a slight bulge in the lower belly area. She was only 16 days pregnant here.
Second pic Abigail was 23 days pregnant
Pic three Abigail is 24 days pregnant, now you can see
Pic four 24 days pregnant, shows the clear teats.
Pic five 24 days pregnant shows teats and large size
Next set is Hermione pregnant:
Pic one Hermione 24 days pregnant, can just see teats
Pic two Hermione 29 days pregnant
Pic three Hermione just hours before she gave birth, 31 days pregnant.
Pic four - Hermione just hours before giving birth, 31 days pregnant.
Length of pregnancy is 28 - 35 days with 31/32 days usual