I have to inject 80mg of clexane twice a day as I got bi-lateral pulomonary embolisms (blood clots in lungs) in my last pregnancy 3 months ago. I have to keep injecting twice a day until the end of Sept. but we are trying to concieve and if I do get pregnant again I then have to stay on one injection a day until 6 weeks after the birth. I will also have to have it in subsequent pregnancies.
Do take the injections if they have been advised. They are perfectly safe in pregnany and blood clots are seriously life threatening, especially if they end up in your lungs, like mine did. The clots really, really complicated my pregnancy.
There are certain considerations if you are on clexane. I was told I probably wouldn't be able to have an epidural as pain relief and obviously there is greater risk of bleeding at delivery. All these are far less erious than blood clots though.
I inject in both my thighs and both sides of my stomach. Sometimes the injections ting a bit, but they aren't that painful. I do get a small bruise/lump at the injection site, but it's really not that bad.