排卵后体温上升不明显怎么回事啊？

末次YJ2月23号，周期28.29天，按照推算应该是9号PL，但是用PLSZ测的

日期         体温                PLSZ                                                   测体温时间

3号          35.93              强阳                            晚上AA                    7.40

4号          36.17             弱弱弱阳                                                    7.30

5号          36.07             弱弱弱阳                                                    7.30

6号          36.13             晚上强阳                      晚上AA                   7.30

7号          36.43            早是强阳，晚上弱阳      晚上AA                   7.30

8号          36.44                                                                              7.30

9号          36.57                                                                              7.40

10号        36.42                                                                              7.30

大家帮忙看看怎么出现两次强阳，而且还这么早PL，搞不懂了，PL后的体温怎么上升不明显是怎么回事啊？