If you do not see any fertile looking cervical fluid, the first thing to do is to make sure about how you are checking your cervical fluid, especially if you are new to charting. See the guidelines above. If you are sure you are checking your cervical fluid properly, the next thing you want to do is check if you are ovulating by seeing if your temperatures show a clear thermal shift. A lack of cervical fluid along with no temperature rise, or with erratic temperatures may indicate that you are not ovulating. If you are not ovulating for a few cycles, you need to talk to your doctor. If you are ovulating, then cervical fluid production may be affected by one of the factors mentioned above. You may want to check your cervical fluid internally at your cervix. You will also want to find out what your own most fertile cervical fluid looks like and treat this as eggwhite fluid. It is important that you have intercourse as close to ovulation as possible as your partner's sperm may not be able to thrive while waiting for the egg to be released.
Re: What causes a lack of EWCM?
You can also check out out fertilityfriend.com https://www.fertilityfriend.com/HelpCenter/FFBook/ff_fertility_signs.html
Specifically about lack of EWCM from FF.com:
No Eggwhite Cervical Fluid:
If you do not see any fertile looking cervical fluid, the first thing to do is to make sure about how you are checking your cervical fluid, especially if you are new to charting. See the guidelines above. If you are sure you are checking your cervical fluid properly, the next thing you want to do is check if you are ovulating by seeing if your temperatures show a clear thermal shift. A lack of cervical fluid along with no temperature rise, or with erratic temperatures may indicate that you are not ovulating. If you are not ovulating for a few cycles, you need to talk to your doctor. If you are ovulating, then cervical fluid production may be affected by one of the factors mentioned above. You may want to check your cervical fluid internally at your cervix. You will also want to find out what your own most fertile cervical fluid looks like and treat this as eggwhite fluid. It is important that you have intercourse as close to ovulation as possible as your partner's sperm may not be able to thrive while waiting for the egg to be released.