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If you stay with your husband for more than a year and do not get pregnant then only you can think of medicines and see your case as a case of infertility
.Presently it is just 6 months so it is fine.The problems in periods can be due to hormonal
imbalance and even due to the infection as you said there is white fluid coming out.The other problem of blood in stools is due to constipation
and the bleeding may be from piles so don't worry it is not related to your pregnancy
in any way.Presently you need to get examined by a Gynaecologist to treat the infection and to help you regarding your periods.Few tips you can try for getting pregnant are:-
-have intercourse every alternate day from 10th to 21 st day from start of your menses cycle if it is a normal cycle of 28 days as this is the most fertile period.
-after having sex do not get up for upto 2 hours after sex as it will help the semen to stay in vagina.
These tips will help you so you can try.
All the best.