Your pill, when taken correctly, is 99.7% effective.
The best lubes are going to be water based (if you use condoms) or you can use silicone based. Really, it'll be whatever ones you like best. You can find sample packs at some specialty stores, and then you can try some until you find one that you like. Around here, were fans of Pink and Astroglide, among others. Vaseline isn't meant to be a sexual lubricant, so you'll want to steer clear of that.
For minor abrasions, just make sure to take it easy. You can use a cool damp washcloth as a compress when you are at home, and make sure you wear underwear made of a breatheable fabric, like cotton. If the cuts are on your outer labia, even some aloe vera gel could help (make sure it's the plain stuff). In your vagina, though, the best thing is just time.
Make sure you stay hydrated. Pee when you feel you have to, don't hold it if you can help it. Make sure to urinate before and after sex, and you might even consider taking cranberry supplements. Cranberry has been known to help fight the bacteria that can cause infections. However, it would only be efficient if you took the supplements, and the regular juice you'd get off the shelf isn't strong enough, and if you were to find actual pure cranberry juice, the stuff is so strong you wouldn't be able to choke it down. (I've tried. It's so sour!!!)
Semen doesn't have to be pure liquid, just as our discharge doesn't have to be perfectly creamy all the time. As long as it is a normal color and overall normal consistency (and semen consistency can change overtime, and from day to day) and normal smell, then there isn;t anythign to worry about.
And lastly, if you are on a combined monophasic pill, you actually have up to 12 hours before your pill is even considered missing. You have a good three hours on each side of your normal time and it still counts as on time. That means if you usually take it at 6pm, then you could take it anywhere between 3 and 9pm and be fully protected still.
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