Guppy breeding behaviour?

sometimes it is a perfectly normal behavior for guppies but like u said it would be hard to tell if she was pregnant for sure but to me it sounds like she needs some time alone to have her babies (if she is pregnant) away from the male because she could kill him or her babies or he could start to try to breed her and she might get so stressed that she doesnt have her babies before she dies so separate them and leave her go for a couple of days