If you want to use condoms, experiment with different ones to see which you like best. Get a sampler pack from a condom online store, turn it into a party or a fun bedroom experiment.
Practice turning condom wearing into a sex act/foreplay, if you are the one not wearing the condom, learn how to put the condom on with your mouth, or lie back and play with yourself as he puts it on to keep yourself engaged and him interested.
Add a drop of lube to the end of the penis before donning the condom, this will increase sensitivity. Put lube on outside the condom as well. Try different positions besides missionary.
If you don't want to use condoms, learn more about how your body works. I'm not into the pill or artificial hormones. Go to this site and learn more about your cycle
Ovulation Calendar
You only have a 5 day window in which to get pregnant, so work around that